Plant ID forum: Can anyone tell me what kind of weed this is?

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Wauwatosa, Wi
dgreen97
Jun 17, 2017 11:01 AM CST
I can't figure out what weed this is, it pops up in my garden every year and I don't know how to stop them from growing. I attached pictures

Thanks

Thumb of 2017-06-17/visitor/af5df2

Name: Trish
North Yorkshire
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Yorkshirelass
Jun 17, 2017 11:22 AM CST
I think your weed may be annual sun spurge (Euphorbia helisopia). Does is exude a milky white sap if you break the stem? - Take care not to get it on your skin if it does, it may cause a rash.
The garden, where my mind goes to seed.
Wauwatosa, Wi
dgreen97
Jun 17, 2017 11:56 AM CST
I checked them there just greenery they don't have any white stuff. I've pulled them out of the ground lots of times with no rash. Can't for the life of me figure out what they are but they only pop up in bare areas
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Jun 17, 2017 12:00 PM CST
Welcome!

Is it possible for you to post a picture showing the plants closer so we can see more detail?
Wauwatosa, Wi
dgreen97
Jun 17, 2017 12:02 PM CST
Sure will do when I get home
Wauwatosa, Wi
dgreen97
Jun 17, 2017 4:29 PM CST
Here are more pictures of it

Thumb of 2017-06-17/dgreen97/d792c6
Thumb of 2017-06-17/dgreen97/2fd10f

Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Jun 17, 2017 5:56 PM CST
I think Trish is right, it does look like a Euphorbia. Maybe Euphorbia peplus?



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Are you certain that when you snap a stem to break it there is no milky sap that comes out?

Wauwatosa, Wi
dgreen97
Jun 19, 2017 10:05 AM CST
yeah they do look really similar, im not 100% sure thats it but thats the closest Ive seen to what it looks like. now the question is how do you stop it from growing? i put down preen and its still growing through that
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Jun 19, 2017 10:30 AM CST
Which Preen product did you use? I assume it was the pre-emergent so when you say it is still growing through that, you mean you had applied the Preen before it had started to germinate?
Wauwatosa, Wi
dgreen97
Jun 19, 2017 11:30 AM CST
yeah i applied it after some of it was already grown but this new stuff that popped up came after I had applied preen. so the old stuff i know wasn't going to be killed by preen because i applied it after, but these new weeds shouldn't have come up since it was applied.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Jun 19, 2017 6:10 PM CST
Can you tell us exactly which Preen product it was, there are several:

http://www.preen.com/products/...

Edited to add if it was Preen Garden Weed Preventer, that contains trifluralin. Another product that contains trifluralin plus another herbicide says it gives "partial" control of several Euphorbia species. So maybe it isn't the best herbicide for that weed. Your best bet might be to call the toll free number on the product and ask them. Or just keep pulling/hoeing it out until the seeds in the soil are gone. Make sure not to let it produce more seeds!
[Last edited by sooby - Jun 19, 2017 6:20 PM (+)]
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Wauwatosa, Wi
dgreen97
Jun 20, 2017 9:07 AM CST
it was this one, i attached an image
Thumb of 2017-06-20/dgreen97/c05158

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