Trying to identify garden weed and how to control/eliminate

Asked January 5, 2020, 2:38 PM EST

The attached weed was introduced into my garden when a landscape company put in mulch 3 years ago. I have tried to identify it and figure out what it is so I can control it. It over-winters and Roundup does not seem to eliminate it. It gets a small white flower on a center stem.

Looking for Identification and what herbicide will work.

HELP. Thanks in advance

Oakland County Michigan weed issues hairy bittercress

3 Responses

Hello,

This is hairy bittercress,, a weed that produces thousands of tiny seeds. You can put a pre-emergent down in fall to prevent its seeds germinating. There are some post- emergent herbicides, but Roundup (glyphosate) is not one of them.

Here are a couple articles which list control options, including chemicals-

https://extension.umd.edu/hgic/topics/hairy-bittercress

https://www.canr.msu.edu/news/hairy_bittercress_a_weed_to_watch_out_for

You will have to monitor and treat the weeds several seasons before you are rid of all the seeds in the area. Thank you for using our service.

Laura - Thank you for the response and information. It is very helpful.

I notice that the article suggests a pre-emergent applied in the fall. As the article says that the weed germinates in the October time-frame, I am assuming that it is too late to apply now, and I will have to wait until this coming fall to address from a pre-emergent perspective - please confirm?

Ed

Hello Ed,
yes wIt until next fall. Pre-emergent usually lasts about 6 weeks, so time your application accordingly - a little early is OK.
Also, minimize new seed dropping by killing the current season’s crop before , or as, it flowers
Glad this helped!