We would like to help you identify weeds that you find around the county. If you see a weed that you would like identified please upload your photo below and include any details associated with the plant. It is especially helpful to add a common object to the photo for scale and try to include as many details as possible (location landmarks, size of the plant, size of the infestation, time of year, time of day photo was taken, height etc.) We will try to identify the plant and if you would like, help with management recommendations.

Before submitting, scroll down and review past submissions to make sure your weed hasn't already been identified.

Files must be less than 2 MB.
Allowed file types: gif jpg jpeg png.
LC Admin only: Enter the response and it will show up on the page.

Past Submissions and Responses

Click an image to enlarge.

screenshot_20220119-202759_message.jpg (326 KB)

inbound764365321.jpg (826 KB)

3645a6aa-cf18-4f5b-b34e-59d43a01f69a.jpeg (63 KB)

image_berries-red_20211227.jpg (137 KB)

759e9e91-b89b-41a9-b09f-d83327ccc4d6.jpeg (1547 KB)

This is a Rose Hip from a wild Rose shrub.

b47f1539-3f71-4674-907e-b66e44864e55.jpg (1732 KB)

Hello - I think this is Woollyleaf Bursage. Its an aggressive perennial in the Sunflower family.

unidentified_lawn_weed_nc.jpg (532 KB)

This looks like Common Wireweed. Here is some more ino: https://greencoverinitiative.com/wild-plants/sida-acuta-common-wireweed

img-20211021-wa0003.jpg (71 KB)

This is Redroot Pigweed. Its an annual weed that is very common.

687c3ba8-8f66-4b7b-9e72-79b582f6a1fa.jpeg (615 KB)

This is Smartweed. It's an annual in the Buckwheat family.

weed2.jpg (1732 KB)

This looks like a type of currant, possibly something in the gooseberry family. I think your local Extension Office would be able to better ID the exact species as there are many. Here is some more info: https://gobotany.nativeplanttrust.org/family/grossulariaceae/

29e87ab1-9fb1-4446-bf45-560f068bbb8c.jpeg (156 KB)

This is Venice Mallow. Here is some more info: https://crops.extension.iastate.edu/encyclopedia/venice-mallow

e77edf4c-f466-4fcc-93ac-60ce7faa1fa4.jpeg (54 KB)

It looks like a prostrate knotweed. You should pull it up. It's a spreading annual.

e098449f-9b5c-48f2-93e2-7bf702d53ba8.jpeg (654 KB)

This is a strange plant called "Beetberry". Here is some more info: Growing Beetberry (mortaltree.blog)

7027e810-bc60-471e-9004-3000b592633e.jpeg (803 KB)

This looks like a Yarrow plant.

d80a7cca-782e-4e64-82e1-1937d62b6ccc.jpeg (1369 KB)

This weed is called Creeping Charlie - here is some more info. https://turf.umn.edu/news/creeping-charlie-management-and-value-pollinators#:~:text=Creeping%20Charlie%20is%20considered%20by,a%20characteristic%20called%20%E2%80%9Callelopathy%E2%80%9D.

weeds_in_yard.jpg (1046 KB)

The smaller weed looks like common chickweed. The larger weed looks like prostrate knotweed. Both are annual weeds.

8afe3d74-3283-4995-b7f5-5e870ac12941.jpeg (68 KB)

That is Nicotiana. It's a garden plant - here's some more info - https://hort.extension.wisc.edu/articles/flowering-tobacco-nicotiana-sylvestris/

This look like a type of knotweed. It's an annual weed and there are many species.

20210901_132946_resized.jpg (1743 KB)

This is Yellow Owl's Clover - Here is some more info: https://www.americansouthwest.net/plants/wildflowers/orthocarpus-luteus.html

img_3121.jpg (1510 KB)

This looks like White Prairie Aster. It's a native perennial that spreads by horizontal roots.

aaplant1.jpg (638 KB)

These look like wild violets - Herbicides containing triclopyr provide the best control of wild violet species; however, repeat application over the course of the growing season and over multiple years may be needed for effective control.

weed_7.jpg (360 KB)

This is Curly Dock that has gone to seed.

5e00d0fa-cbab-4204-bee9-46842a77507a.jpeg (730 KB)

This is curly cup gumweed. Use Milestone herbicide with a non-ionic surfactant to get rid of it.

6d7df6a7-3b1d-41cd-bdb5-5877ca9a3542.jpeg (2002 KB)

This is a Passion Flower. Here is some more info: https://www.britannica.com/plant/passion-flower

20210808_182254.jpg (1818 KB)

This looks like a type of Milk Vetch - Cicer Milk Vetch - Here's more info:

img_3143_1.jpeg (271 KB)

This is Diffuse Knapweed. Very widespread in Estes Park.

image_0.jpg (1788 KB)

This is Smartweed. It's in the Buckwheat family of plants. Use 2,4-D with Dicamba on it.

20210806_170436.jpg (928 KB)

This is Toothed Spurge. It's a native annual.

weed_or_flower.jpg (98 KB)

This is western yarrow. It's a perennial in the sunflower family.

f5e9ecb8-3369-45ae-ba60-f96fa941fbf4_0.jpeg (944 KB)

This is showy milkweed.

f5e9ecb8-3369-45ae-ba60-f96fa941fbf4.jpeg (944 KB)

This is showy milkweed.

20210801_120719.jpg (922 KB)

This is Hairy Nightshade. It's an annual. The berries are toxic.

20210729_155505.jpg (1134 KB)

This looks like cutleaf nightshade. When the fruits form be aware that they are toxic.

img_42862.jpg (1999 KB)

This looks like sweet clover. It can become invasive so I'd remove it.

img_1006.jpg (1574 KB)

This looks like bristly foxtail.

b2d5dbdb-48ee-4fe5-bf90-73a5cfceb95e.jpeg (708 KB)

This is curly dock. It has already gone to seed. Too late to spray now but a 2, 4-D product with Dicamba will work if you spray it before it goes to seed. Products like Rangestar or Rifle-D will work.

87c09333-c72a-4273-809a-be20265e7dcc.jpeg (1059 KB)

I believe this is Catchweed. We see a lot of this when there is lots of moisture. It's a viney annual in the Borage family. The leaves are covered with stiff, bristly hairs that cling to anything.

f5859cb0-7a33-4bf8-8618-39e49c96f513.jpeg (2017 KB)

This looks like Myrtle Spurge. It's a noxious weed in Colorado and needs to be eradicated.

plant_on_property.jpg (1094 KB)

I think this is Fetid Marigold. It's a native annual. When the plant is crushed it releases a bad odor.

img_20210719_135619778.jpg (428 KB)

This weed is prostrate knotweed. It's an annual weed.

too_tough_to_pull.jpg (82 KB)

I will need a better photo, or several to make an ID

The round dark green leaf and fuzzy pink are all one plant. It's a smoke bush/tree. Looks like someone mistakenly cut it to the ground and it's trying to grow back.

20210716_090733.jpg (215 KB)

This looks like a shoot from an aspen. The roots are probably not dead.

858dc2d1-c468-49dc-b8d5-c6eda914eb8f.jpeg (806 KB)

This is from a grass called Needle & Thread grass. It is a native grass.

img_20210713_082949202.jpg (945 KB)

This weed is in the mallow family. Its a perennial. AN herbicide like Telar or Escort will kill it.

c3ba27bd-54e9-4f17-a552-22f9f17801e1.jpeg (1157 KB)

Curious if this flowered yellow. I think it's Broom but can't make positive ID from photo.

bcc3509c-1a59-4e96-808b-c6fef4c3ed27.jpeg (162 KB)

Genue Fatoua - here is more info: https://en.wikipedia.org/wiki/Fatoua_villosa

plant_loveland_7-12-21.jpg (45 KB)

This is common mullein - it's a weed.

84271cbf-6152-438a-b569-a6d3aa2ee359.jpeg (1738 KB)

This is a prostrate spurge. It's an annual weed that forms a dense mat. It's easy to pull, but make sure to get the roots.

img_4237.jpg (1730 KB)

This is Horse Cinquefoil. Here is some more info: https://fieldguide.mt.gov/speciesDetail.aspx?elcode=PDROS1B0V0

unnamed-2.png (689 KB)

These weeds are wild or prickly lettuce. Sometimes confused with thistle.

4c2cda61-0221-4cc1-ac73-30b8181cf7d0.jpeg (188 KB)

No idea what this is. Sorry!

img_4336.smaller.jpg (1231 KB)

This is nettleleaf goosefoot. This is an annual weed.

img_3427.jpg (1330 KB)

This looks like Hawksbeard. It's an annual in the Sunflower family. It's got a taproot so it may be hard to pull. Will spread by seed.

img_3428.jpg (1522 KB)

These are mustards. Once they dry out it's too late to do anything. It's an annual weed and we saw a lot of these this year because of the rain. It's too late to do anything now, but next year you can pull them or spray with Telar.

image0.jpeg (1347 KB)

This is some type of tree/shrub sprouting.

img-weed_vine_with_seeds_1.jpg (1327 KB)

This is Catchweed. It's a native annual but can be very annoying as the dried seed pods stick to everything.

b2dfa981-4a21-4bc1-8a95-d2e697f94eb9_0.jpeg (402 KB)

This is Passion Flower. Here is some more info: https://www.britannica.com/plant/passion-flower

d80d6b0a-85f7-4974-b13f-f990bcb12db6.jpeg (832 KB)

This is showy milkweed. It's a perennial that spreads by seeds. This is a avorite plant or the Monarch butterflies but can be posionious to livestock.

weed_5.jpg (1912 KB)

This is fetid marigold - here is some more info - http://southwestdesertflora.com/WebsiteFolders/All_Species/Asteraceae/Dyssodia%20papposa,%20Fetid%20Marigold.html

b4bf06a5-820c-49af-9e22-0bf3808a0268.jpeg (492 KB)

These look like a perennial groundcover called "Pussytoes".

5b15b10b-a3b3-4139-aded-1fdedfa730d1.jpeg (1051 KB)

This is Western or Common Yarrow. Common Yarrow has white flowers

58395c90-0b65-4f1e-aaa7-235131e9ea74.jpeg (806 KB)

This looks like Silverleaf Phacelia - here is some more info: https://www.gardenia.net/plant/phacelia-hastata

output-onlinejpgtools.jpg (493 KB)

This looks like Creeping Bellflower. It can be very invasive if not taken care of. Here is some more info: https://www.winnipegfreepress.com/our-communities/times/correspondent/Keep-creeping-bellflower-out-of-lawns-gardens-574547571.html

img_0830.jpg (1749 KB)

This is Giant Ragweed. It's a native annual.

img_20210623_090943308_2.jpg (268 KB)

This looks like Shepherd's purse. It's a winter annual in the Mustard family.

20210623_064415.jpg (1775 KB)

This is Field Bindweed.

a9b62d6d-40dc-44b6-98d7-7e0b15abba4a.jpeg (1365 KB)

We cannot ID this - try CSU extension

img_20210621_153903small.jpg (452 KB)

This is in the Aegopodium family. It's also called Bishop's Weed or Ground Elder. Some people plant this for a ground cover. There are lots of different varieties.

b54f80a7-a610-4865-8863-48922ed5955d.jpeg (46 KB)

This looks like Bindweed. It's an annual that spreads rapidy.

289cbcf6-7723-4fba-88f0-eadaa80b19e0.jpeg (138 KB)

We cannot ID this - try your local Extension office

f19875d0-94d7-40cd-86b4-8eab6e4b5a33.jpeg (159 KB)

This looks like a Sumac growing through your Spruce.

img-1345.jpg (1267 KB)

This is Catchweed Bedstraw, sometimes also called Cleavers or "Sticky Willy". It appears more when we get lots of moisture.
Catchweed Management Recommendation:
Any type of mechanical removal where the plant can be thrown away would prevent the seeds from spreading. The one plant that was brought in here earlier this week was already producing seeds. If when removing the plant the roots are not pulled up, then followup with 2,4-D within a week or two. Next year, control plant early either by pulling or spraying before flower. There may be a seed source at that spot so it may take several years of control before it will be gone

thistle.jpg (47 KB)

This looks like Canada Thsitle. Use Milestone to eradicate thistle as long as its not in turf.

img_0785.jpg (158 KB)

Can't ID this - wait until it flowers and maybe try sending again.

677cbdd3-938b-46a7-8658-d074623b4204.jpeg (192 KB)

This is common mallow.

396e005e-89ca-4afc-ba50-1b146ec52cf6.jpeg (44 KB)

This is Canada Thistle. Its a noxious weed in Colorado. Remove it.

16236236255781007500084962791318.jpg (1028 KB)

Check with your local Extension office.

21bd4151-4ae3-4be2-9be1-b7325e09df1a.jpeg (1634 KB)

This looks like they it could be in the Sunflower family.

20210609_175823.jpg (973 KB)

This is Redstem Filaree or "Storks bill". It's in the geranium family. Here is some more info: https://uspest.org/mint/redstemfilaree.htm

carpenter_wy_0.jpg (1283 KB)

That is Loco weed or sometimes called Crazy weed. It's very toxic to livestock. We are seeing a lot of this weed because of all the rain we've had.

carpenter_wy.jpg (1283 KB)

That is Loco weed or sometimes called Crazy weed. It's very toxic to livestock. We are seeing a lot of this weed because of all the rain we've had.

pature_weed_2.jpg (18 KB)

This is yellow alyssum. It's in the mustard family. It's too late to spray now since it's gone to seed but if you keep an eye on it next spring you can use Telar.

arrow-leaf_q_img_6242.jpg (468 KB)

This looks like creeping bellflower. It's very invasive. It's a perennial escaped from ornamental gardens which has become a weed problem. It spreads by seed and creeping rootstock, and thrives in sun or shade. Eventually it will send up a flowering stem with attractive, nodding, bell-shaped flowers arranged on one side of the stem.

img_1912_0.jpg (290 KB)

This is Dalmatian Toadflax. It's a noxious weed and you should get rid of it before it spreads. If you need more info, contact me.

97267a62-0d1f-4c1b-b6dd-0bf3e449a48f.jpeg (33 KB)

This looks like curly dock but I would like a better photo of the leaves.

img_1912.jpg (290 KB)

This looks like Dalmatian toadflax. A noxious weed that is very Invasive. If you need more info, contact us.

c791e6eb-40da-45c7-aa37-7dc7d2cf27cf.jpeg (1614 KB)

This looks like a sprout from a tree. Do you have trees with similar leaf shapes in the area?

jointed_weed.jpg (166 KB)

This is Field horsetail. Its a perennial and usually grows in damp areas.

weeds.jpg (390 KB)

This is field horsetail. It's a perennial - a native that is common in high water table areas.

1622069515071498682342.jpg (1560 KB)

This is kochia. It would not be a good ground cover.

20210515_153629.jpg (1072 KB)

This is yellow alyssum. It's an early mustard. It's very prominent this year because of all the moisture we've had. Using an herbicide like Telar, applied early spring will control it.

cf5396d1-2e93-4f1b-a136-c41cf48798a9.jpeg (1740 KB)

This is Fumitores. Its an annual flower and also an herb. Here is some more info: https://www.britannica.com/plant/fumitory

20210525_150312_2.jpg (1280 KB)

This is yellow alyssum. Its an annual in the Mustard amily.

20210525_150252_2.jpg (437 KB)

This is in the Genus Leymus. It could be a type of wheat grass.

20210525_094937.jpg (1558 KB)

This is Common Orache - here is more info: https://luontoportti.com/en/t/880/common-orache

e84d9b74-85c5-45f0-b476-052a7b966717.jpeg (391 KB)

This is wild lettuce. You'll need to start a good lawn program or hire someone to fertilize, spray etc so the weeds will be choked out.

f48be050-8cf3-4fd4-bc3c-a279134ad306.jpeg (451 KB)

This is Virginia Creeper. It's a perennial vine that can become invasive.

This is Virginia Creeper. It's a perennail vine but can become invasive.

970489cc-e0c9-4f1a-bc01-475058f4a233.jpeg (1628 KB)

This could be from a Linden tree seed.

20210518_121216.jpg (1027 KB)

These seedlings are too young to ID. Send another photo when they have 2 or 3 leaves.

38bb6bd5-4a69-400f-93ff-033187a404c2.jpeg (815 KB)

This looks like kochia. It's an annual that spreads by seed. I've heard that chickens like it. It can become invasive once it flowers and the seeds spread.

d845beca-47ea-415d-bab4-f3c85c6871d9.jpeg (0 KB)

cb5a84c1-95b4-47e8-be18-14aaa0f399ad.jpeg (58 KB)

This is red stem filaree. Goatheads do have yellow flowers.

16211021743731130510996798541226.jpg (1310 KB)

This could be something in the Nightshade family. Need a bigger leaf to positively ID.

20210514_191809.jpg (1772 KB)

I think this may be ivy leaf speedwell.

25f8b39a-d0f6-4950-aa39-ebad2d1299e8.jpeg (169 KB)

That looks like cutleaf nightshade. Its a weed so I'd get rid of it.

f3c0f4f4-88d7-4a33-b314-2dae4c6de397.jpeg (570 KB)

This is kochia. It's an annual that spreads by seed.

650c7bde-615e-4930-8ca7-6afc58758644.jpeg (642 KB)

This is yellow alyssum. It's an annual in the mustard family.

weed-2.jpeg (286 KB)

That is Catchweed Bedstraw, or cleavers etc.

unknown_weed.jpg (1335 KB)

This is henbit. It's an annual in the Mint family.

20210511_172334.png (1555 KB)

This looks like a creeping bellflower growing in your turf grass. It's very invasive and spreads quickly. Here is some more info:

Digging up with a shovel can work for small infestations. Make sure you get the roots. Monitor to make sure there is no more growth.

If you have creeping bellflower plants in your lawn, you can spray them with an herbicide containing triclopyr, such as Ortho Weed-B-Gone. Triclopyr is a broadleaf herbicide that won’t harm grass, but it will kill garden plants. Products containing glyphosate (RoundUp) may be effective but keep in mind that the chemical kills any broad-leaved plant it touches. If this is a concern, apply glyphosate (RoundUp) carefully to the leaves with a brush or sponge. Otherwise, spray the product directly on the plant.

loveland_050921.jpg (160 KB)

That is blue mustard. It's an annual weed.

weed_2_1.jpg (1164 KB)

That is alfalfa.

weed_4.jpg (1876 KB)

This looks like Western Salsify. It's a biennial that has a yellow flower the 2nd year. It has a large taproot and a white milky substance.

unknown_weed_3.jpeg (1645 KB)

Hello, This is White Campion. It's a short lived perennial or biennial. Here is some more info:

img_2549.jpg (98 KB)

I can't ID the first photo, but the middle one is rabbitbrush, a native, and common mullein (invasive weed)

198d8dfe-47e9-45ec-9323-20f945c53bbf.jpeg (149 KB)

It looks like Creeping Bellflower. It was once a garden plant but has become invasive. There are many articles online regarding this plant.
Here are some control methods -
Pulling is generally ineffective, although you may prevent reseeding. You may get the shallow, thread-like roots, but the plant will quickly rebound and send out new growth from the deeper roots. Mow or deadhead creeping bellflower consistently to prevent reseeding. If all else fails, creeping bellflower in gardens may warrant careful application of herbicides. Don’t waste your money on 2,4-D because creeping bellflower tends to be resistant to that chemical. If you have creeping bellflower plants in your lawn, you can spray them with an herbicide containing triclopyr, such as Ortho Weed-B-Gone. Triclopyr is a broadleaf herbicide that won’t harm grass, but it will kill garden plants. Products containing glyphosate may be effective but keep in mind that the chemical kills any broad-leaved plant it touches. If this is a concern, apply glyphosate carefully to the leaves with a brush or sponge. Otherwise, spray the product directly on the plant. Herbicides are most effective when temperatures are between 60 and 85 degrees F. (15-29 C.). University of Minnesota Extension says that late spring and early fall are the best times to apply glyphosate. Choose a warm, non-windy day when no rain is expected for at least 24 hours. You may have to use a product several times to completely eradicate creeping bellflower plants – reapply every week to 10 days until the roots no longer send up new growth. Store remaining herbicides in their original container and out of the reach of children.

pxl_20210428_192634030.jpg (1437 KB)

This is creeping Belllower. It's very invasive. It's a perennial.

83599aa2-a40c-49cb-ad66-d49624f11d0a.jpeg (2044 KB)

This is Brackenfern. It is poisonous to livestock. Here's some more information about Brackenfern.

img_6997.jpg (649 KB)

Hello - I think this is hairy fleabane. here is some more info-

309861bf-22f1-4b45-a407-ab40d21dc54a.jpeg (1934 KB)

This is Milk Thistle - Quite a beast! Here's some more info -

Milk thistle identification and control: Silybum marianum - King ...https://kingcounty.gov › services › weed-identification

grassfront.jpg (397 KB)

This is kochia - here's some more information. You will need to spray and encourage the grass to grow.

screenshot_20210418-153033_gallery.jpg (1509 KB)

This looks like Japanese Knotweed. It is very invasive. Here is some more information and ways to get rid of it.

fb2b292b-dc2b-482c-9e88-5d1dc2c85d61.jpeg (1641 KB)

This looks like Lambsquarters (Goosefoot family). Here is some more info:

20210412_200638.jpg (1288 KB)

Hello - we think this may be Hairy Fleabane. Here's some info: http://www.fresnostate.edu/jcast/cati/update/2012-fall/hairy-fleabane.html

Hi Michelle,

Not sure, but this looks similar to a wild Four O'clock. Here's some info: https://www.minnesotawildflowers.info/flower/wild-four-oclock

a22312e3-905f-45e3-aaac-6dea8f04932b.jpeg (647 KB)

That is Red Stem Filaree. It's an invasive weed. Here's some more info:


img_20210329_134535.jpg (250 KB)

It looks like a seedling from a Siberian Elm - here's some info from CSU -https://planttalk.colostate.edu/topics/lawns/1538-control-tree-seedlings-lawns/

img-20210216-wa0000.jpg (154 KB)

That is Dodder. I've attached a link with control info -

e50abfde-e4b0-46ab-a1d5-51601115f273.jpeg (430 KB)

That is Myrtle Spurge - it's a noxious weed that needs to be eradicated.

2020-10-11_13.23.36_large.jpg (551 KB)

That is Prostrate Knotweed. I'd apply a fall/winter weed & feed - most of the fall lawn treatment products have a pre-emergent which really helps the next year.
Here's an article from CSU Extension: https://planttalk.colostate.edu/topics/lawns/1526-fall-lawn-weed-control/

9ac2a33c-c99c-4ad0-b0b7-5c35824f45da.jpeg (1245 KB)

This is buffalo burr. This weed is in the nightshade family and toxic. You should get rid of it! The goats are smart not to eat this! How much of it do you have? It's not hard to dig up, or you can use herbicides to kill it but it's best to spray in early summer before it flowers. Those prickly dried pods are full of seeds and they will spread so removal is advised. You can use Rangestar or something similar with 2,4-D plus dicamba.

b2323f5b-4b68-4204-8178-9f625319d17b.jpeg (29 KB)

This looks like cutleaf Nightshade (Solanaceae). It's a native annual. It contains toxic alkaloids, especially the berries that form after the flower.

a340035e-3fe0-44d4-932c-778737e17ac3.jpeg (1458 KB)

That is Buffalobur. It's a native annual. The berry contains many seeds. It is drought resistant and serves as a host for the Colorado potato beetle.

2020-08-14_13.58.34.jpg (247 KB)

This is field bindweed (white flower) & kochia. Neither are Noxious weeds but both are invasive. Nothing profitable about these weeds.

2020-08-14_13.56.56.jpg (249 KB)

This kochia. It's not a noxious weed but it is very invasive.

db0679d8-cce5-49fe-91b5-2d0bded70f2d.jpeg (216 KB)

This is prostrate spurge. It's an annual weed that spreads by seed. They aren't too hard to pull, just make sure you get the roots or they'll grow back. If you have it in areas that are not lawn or garden, you can use Round up - but watch not to spray it on any other plants or grass. It's very common in late summer.
Here is some info from the Extension office -
Better Lawn Care.Com: Prostrate Spurge: http://www.better-lawn-care.com/prostrate-spurge.html#axzz3k5Z1hUhv
Plantalk Colorado: #2118 Herbicides: Pre-emergent: http://www.ext.colostate.edu/ptlk/2118.html

img_3508_1.jpg (1037 KB)

This is prostrate spurge. It's an annual weed. Most pre-emergent lawn products applied early in the season will help. Your plant is getting ready to go to seed so if you can pull it now you can avoid those seed germinating next year. It's easy to pull but try & get the roots.

2956bb9f-3648-4cf5-85c1-e1447e8de9aa.jpeg (591 KB)

This looks like goose grass to me. We are not turf experts so i'd contact CSU Extension. Here's an article on Goose grass prevention:


img_0223.jpg (263 KB)

This is prostrate spurge. It's an annual weed that forms a dense mat. It can be easily pulled as the roots are shallow. Most over the counter weed products or Weed & Feed will take care of this.
The healthier your lawn, the less invasive this will be. It is very common this time of year.

weed_2_sm.jpg (871 KB)

That is Canada Thistle.

2020-08-18_07.45.36_large.jpg (761 KB)

That is a cutleaf nightshade. It is an annual. It contains toxic alkaloids.

1597311215980.jpeg (69 KB)

That is kochia. It's an annual weed that spreads by seed.

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That is bindweed. Hard to get rid of in grass. Here's an article from CSU Extension on how to deal with it.


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This looks like a "sucker" or sprout from an Aspen tree.

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This is Kochia - it's an annual in the goosefoot family.

That's prostrate spurge. It's an annual weed. If you pull/dig it, try to get the roots, they are pretty easy to pull. If you want to spray it, you can use Round Up

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That is kochia. If you can mow or cut it down before it goes to seed it will reduce the spread. It's an annual & spreads by seed. If you want to spray with herbicides you must do it when its about 5" tall or herbicide is not effective.

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That is wild violet

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That looks like kochia growing in the grass.

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That is field Bindweed

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That is a prostrate spurge. It likes moisture. It's an annual. Most lawn care products that take care of weeds will get rid of this. Otherwise, you can pull it and make sure you get the roots.

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That is kochia

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If you can pull it out, do so. If it goes to seed, those seeds will germinate in your lawn, so your mowing is helping.
If you do not treat your lawn each year with weed & feed products, I'd start there. Once the turfgrass is healthy and growing well it should choke out the kochia and other weeds.

If you can find an herbicide with Fluroxpyr in it that will work. You'll have to make sure it is labeled for use on turf.

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It's one of two weeds - if it's somewhat like a succulent (fleshy leaves/stem) it's common purslane. If the leaves are flat with tiny red spots it's spotted spurge.
Both these weeds are growing now in turf and garden areas. If you are pulling try to get the roots. They are both annuals.
I couldn't enlarge the photo enough but sure it's one of the two.

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This looks like something in the nightshade family and I'd pull it out of your garden.

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That is yellow sweetclover. It's not a noxious weed.

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That is yellow sweetclover. It's not a noxious weed.

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This looks like lambsquarters.

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That is kochia

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That is kochia. You can keep mowing it down or apply an herbicide that contains Fluroxypyr.

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Those weeds are Common Mullein. They are not noxious but very invasive.

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This is Canada thistle

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Musk Thistle

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Canada Thistle

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That weed is Common Purslane. It's an annual weed that likes moist areas. If you can pull it and get the roots you can control it.

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These are weeds.

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That looks like a sprout from an Aspen tree

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This looks like an aspen tree sucker, coming up from the roots of the tree.. Maybe send it off the CSU extension to ID. We are good with weeds but the Extension office can probably be a better help to you esecially if you have it in turf..

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This is Purple Groundcherry. It's a native perennial in the nightshade family.

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That is yellow alyssum. It's an annual and spreads by seed. The plant has already flowered and those are seed pods. It flowers early and flowers are yellow. It's too late to spray now as it's gone to seed and will be dying out soon. You can look for it again next year and use Telar with a surfactant.

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Yes, this is a weed. It's Yellow Salsify. It's a biennial in the sunflower family.

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That is Miners Candle, which is a native plant. You may consider keeping it. I'm not sure Milestone will kill it, I'm more likely to recommend 2,4-D with Dicamba.

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The leaf looks like a "mallow" - here's a photo of Alkali Mallow - gets a white flower

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This sure looks like cheat grass which is an annual so it'd be easy to pull.

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That weed is Houndstongue. You should get rid of it. You can dig it fairly easily. The seeds are velcro-like and attach to clothing & animals and are very difficult to remove.
If you'd like to use an herbicide 2,4-D will work.

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This is Musineon, a native in the parsley family. Here's some more info about it.

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That looks like Kochia. You would need to use something like Vista (fluroxypyr) on it as it is resistant to 2,4-D .

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That is Flixweed. You can use Telar or Escort on Flixweed and it's safe to use on the hay.

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That is yellow alyssum. It's an annual in the mustard family.

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That weed is Hoary Cress, also known as "white top". It's a creeping perennial in the mustard family. It's a list B weed in Colorado and is required to be eradicated.
You can use an herbicide called "escort" to get rid of it. It must be applied at the flowering stage. Mowing repeatedly during the growing season if not using an herbicide to control in
spring/summer timeframe will help.

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That is Canada thistle. If you can dig them out of your lawn do so. Try and get the root. They are easier to pull/dig after rain or watering. The seeds may have blown in from the fields.
There are not many herbicides for turf that will kill thistle.

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This is a weed. Curly Dock.

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We think this is cheat grass. We do have an herbicide called Plateau that is a pre-emergent. You have to put it down in late summer, It would not work on the cheat grass at this point.
I sell Plateau here at our office. If you need more info, let me know.

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That weed is "catchweed" and it's in the Borage family. Catchweed was rampant last year because of all the moisture. It could be the same this year.

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This is Kochia. Kochia is a hard weed to control. thing to grow back. You can manage it by tilling or hand pulling if feasible. Mowing will only make it grow back stronger.

We have an herbicide called E-2 which is a 2-4,D Dicamba mixture with flouroxpyr that works well on Kochia. It has become resistant to many herbicides over the years. If you want to discuss herbicides, call me at the office 970-498-5768.

Puncturevine or "goatheads" are annual weeds and you can get some control by digging and pulling. You really need to do this before any seeds set. The best herbicide to use is Telar,(Chlorsulfuron) it has soil residual activity which will provide season long control as this weed has multiple flushes during the growing season. Telar is not recommended for turf.

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I believe this is broom snakeweed. Its Native to Colorado. It's not on any noxious weeds lists but it can be invasive. If you wanted to spray it with an herbicide, we'd recommend something like Milestone.


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This is Alfalfa. It is cultivated as an important forage crop. It is used for grazing, hay, and silage, as well as a green manure and cover crop. A 2,4-D w/Dicamba herbicide should get rid of it.

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That is Canada thistle - it seems to have a "gall" on the end. You do not want more of this. I do not think this would prevent the knapweed from flowering.

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Yes, it's in the nightshade family. I believe its Hairy Nighshade, which is an annual. The plant grows in cultivated fields as well as waste areas.

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Yes, it's a Tree of Heaven. Its rapid growth also means it can crowd out nearby native plant species, and its aggressive root system can cause damage to pavement, sewers and building foundations. Tree-of-Heaven has an even number of leaflets on each leaf while smooth sumac has a single leaflet at the end of the leaf. The leaflets are distinctive. Smooth sumac leaflets are serrated along the entire margin. Tree-of-Heaven leaflets have one or two “glandular teeth” at the base of the leaf.

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That weed is "prostrate spurge". It's actually easy to pull - you'd want to make sure you get the roots. Its an annual so it grows by seed.
If you want to use roundup that will work on it, but it will also kill any other plant it touches. I believe there is a lot of it this year because of all
the moisture we've had.

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This is field bindweed.
Field bindweed is a non-native deep-rooted perennial that reproduces from seed and creeping, horizontal roots (rhizomes). Field bindweed stems are prostrate (grows low to the ground) and twining, and grow up to 6 feet long. Leaves are distinguishable by their arrowhead shape. The flowers are bell or trumpet-shaped, white to pink in color, and are about 1 inch long. Field Bindweed seeds can remain viable in the soil for up to 40 years.

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This is common mallow. You should pull it now while it's small. As it grows, the roots become very hard to remove. There's nothing you can spray on it that won't harm the new grass at this point.

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This is cutleaf nightshade which is an annual plant.

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This looks like cheatgrass. Not positive since its dead. If you can send a photo earlier in the year with the seed heads we can ID it for sure.
We have an herbicide here called Plateau that can be put down in August (late summer) as a pre-emergent if it is cheatgrass..

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Hi Jean,
we are not turf experts here, but this looks like crabgrass or goosegrass. You can get more info by contacting the CSU extension office.
Here is a video that you may find helpful -

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This has been identified as Pursh Povertyweed. Its a native plant. Since its in the aster family, milestone herbicide should take care of it.

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This is Catchweed. Here's some more info on it. This seems to be rampant this year from all the moisture we've received.


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This is flixweed, a winter annual in the mustard family.

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This is Flixweed, a winter annual in the mustard family.

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This is not houndstongue - it actually looks like something from the campanula/bellflower family which is an ornamental

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That is Curly Dock.

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This is Flixweed. Its an annual mustard. Once it flowers it will go to seed and die out. It's pretty abundant this year from all the rain we've had.

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We think this could be Catchweed Bedstraw or sometimes called cleavers. Here's some info on it -


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We think this could be Catchweed Bedstraw or sometimes called cleavers. Here's some info on it -


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Cow parsnip or wild parsnip is similar to the photo of the rosette. These get huge also and can cause quite a bad skin rash.

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This has been identified as Catchweed. Its an annual with rough textured leave & stems with bristly hairs that cling to most anything.

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Tthis is red root pigweed. A 2, 4-D herbicide should work on this.

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This is Canada thistle. Dig it up if possible because it can become very invasive. You may want to consult a turf expect or contact the CSU extension office as they deal more with turf issues than we do.

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There is a creeping bellflower (campanula) that is very invasive. How tall does this get?
I'd think something Like Ortho weed be gone would take care of it - what have you used on it? It kills weeds not the lawn.

(Yes, I think that is it. Looked it up on other sites and it fits my description and experience. Thank you!)

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There is a creeping bellflower (campanula) that is very invasive. How tall does this get?
I'd think something Like Ortho weed be gone would take care of it - what have you used on it? It kills weeds not the lawn.

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Thanks - that is myrtle spurge and its very invasive! Its a noxious weed - I'll have to get someone out to "scout" the neighborhood.

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Yes, Myrtle Spurge. Very invasive noxious weed. We will need to go check the area for more. Thanks!

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That's Hoary Cress - a noxious weed.

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That is a yellow alyssum, or mustard weed. Its an annual weed

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This is definitely a perennial weed but we can't really ID it yet. Once its a bit bigger can you re-submit the photo?
Ir may be field bindweed as the description of the flowers seem to fit.

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Hi - the photos on the right seem to be Prostrate vervain - this is an annual weed. I can email a photo and more info if you'd like. The photos on the left are hard to ID as the sunlight is too bright. Can you re-take and we'll see what we come up with. A better photo of the leaf would help. I'm assuming these are just 2 different weeds. Let me know. Thanks!

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this looks like a choke cherry but I'd check with the CSU extension office website since my expertise is in weeds.

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This looks like a choke cherry but I'd check with the CSU extension office website since my expertise is in weeds.

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It's not myrtle spurge. This looks like Milkweed. There are many different varieties and I'd guess it is common milkweed or showy milkweed

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That is Myrtle Spurge - you should get rid of it - it's got a milky substance inside the stem that is toxic and can really irritate skin so be careful & wear gloves. It helps if the soil is moist when you dig it up. Try to get the roots. Then re-check each year to make sure it hasn't re-sprouted. Here's a data sheet on the weed.
The other weed at bottom of photo is Musk thistle - also needs to be removed before it spreads. These are both noxious weeds and need to be removed.

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This is field bindweed. There are over the counter products for turf that can help take care of this.

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That is either crab grass or goose grass. We are not turf experts so you should contact the CSU extension office and they may be able to help you out.

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That's prostrate spurge. Most ready to use lawn care products will take care of it. Weed B Gone or something similar, safe to use on lawns. It'v very common in late summer and can really spread. It does pull out easily, but make sure to get the roots.

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This is Buffalobur. It's a native annual.

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That field bindweed - find an herbicide for lawns with Quniclorac in it.

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This is a pigweeed. We have different types of pigweeds in Larimer county but none of it is so invasive that we require property owners to eradicate it. It's not a noxious weed here. I believe a broadleaf weed kill, like 2,4-D Amine or Rangestar (2-4,D amine with dicamba) would work.

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That is Buckhorn Plantain

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These are "Forget me Nots" or Scorpion Grasses
Scorpion grasses
Myosotis is a genus of flowering plants in the family Boraginaceae. In the northern hemisphere they are colloquially denominated forget-me-nots or Scorpion grasses.
Scientific name: Myosotis
Higher classification: Borages
Rank: Genus

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This is common vetch or hairy vetch. If you can pull or dig it out, making sure you get the roots, that may work. Did you ever try Round Up on it? That may work but you'd have to keep it off the other plants.
If you dig it up , keep checking back for new sprouts and treat them with Round Up. I also read that using an herbicide with tricloypyr in it would get rid of it after several treatments but it may harm the other stuff in the bed so read the label carefully. There are some ready to use products with Tricloypyr at Lowes, Walmart etc.

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That weed is "Flixweed" which is in the mustard family. Its an annual and has a early, short growing season.

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This is Canada thistle.