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[OP]
Sr. Member
Jan 22, 2012
613 posts
238 upvotes
Bradford

Lawn Weeds

So for once I took the time this year and had a great looking lawn. In the past week this invasive weed has taken over and is smothering it.

What is it? Any remedy?
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6 replies
Moderator
May 28, 2012
11692 posts
4232 upvotes
Saskatoon
Black medic and lesser trefoil look similar but lesser trefoil has smooth leaf edges. They are both legumes, which "fix" nitrogen (and may be an indication that your lawn needs more nitrogen).
Deal Addict
User avatar
Feb 10, 2011
1254 posts
425 upvotes
That’s the only weed I have left in my yard. I find after a good rain it hand picks out very well! Comes out easy roots and all. Kinda fun as it travels far... get a bucket and hand pick once a week for the summer!
No One Goes to Palmerston Ontario
Member
Dec 4, 2009
487 posts
371 upvotes
Broadleaf weed killer will knock that down...
Deal Addict
Nov 27, 2013
1554 posts
2161 upvotes
Only thing that will work is a 2,4-D herbicide like killex or PAR III.


The make sure you fertilize plenty so they dont come back
Member
Dec 4, 2009
487 posts
371 upvotes
Mulching Mowers do a good job of keeping weeds from germinating... The clippings blanket the soil, preventing weed growth and retaining moisture after rain. Win - Win!
Deal Addict
Mar 22, 2017
2130 posts
2611 upvotes
West GTA
Looks like Black Medic to me. It's an annual weed - those yellow flowers will turn into bunches of tiny black seeds that will hang out until the following spring. It's annoying to get rid of due to its seed bank. If it's a really small patch you can pull it out by hand (it tends to have viney spreading bits from a central taproot, so yank the taproot and you can pull up quite a bit). If it's big, then herbicides work, so does tarping, and so does cutting grass high and applying plenty of nitrogen, which might slowly get it to lose out over time.

Trick is to try to kill it early - in midsummer it'll set seed then your issue will be several times worse next year.

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