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One last weed - What is it?


LawnSite Member
New York
I am having trouble identifying this one last weed. Anyone know what it is (see pics) ? It has small whitish purplish blueish flowers on it? The lawn is a northeast lawn with bluegrass, rye and fescue. What can I use to kill them without killing the lawn? I have used the Bayer weed killer for lawns and it has killed all the weeds except this one. Thanks in advance for any help you can give me.






LawnSite Silver Member
Shades: I think corn speedwell has more of a heart shape. This may be common chickweed. http://ipm.ppws.vt.edu/scott/weed_id/steme.htm[/url]
Classic Trimec or most 2,4-D, 3 way(as above post) will get it. It's everywhere


LawnSite Senior Member
Corn Speedwell, most 3 way products will get control on , but need to spray with fine droplet (fan tip) application for best control as large droplets will not stay on leaf tissue. 2,4-D is a component in your three way compounds, the most common weed control component for years. Not trying to be a prick, but be sure to take some time to know your weed control products. Best to hit it while still in bloom, once this annual goes to seed the plant will die and the seeding for the next yr is already done, usually a shot window for control. Good Luck!


LawnSite Senior Member
New England
i'd agree that it is speedwell which can be more difficult to control than other weeds and a liquid (with fine spray as mentioned) is much better than a granular control product (I'm guessing your bayer product was granular?) not unussual to have to apply control a couple of times about 10-14 days apart for speedwells

nice pictures by the way


LawnSite Fanatic
Me too. Speedwell for sure - growing in improved cultivars of Kentucky bluegrass. (you can actually see a couple of their light blue flowers).

Good advice above from members regarding control. Fine mist is better if it provides good coverage. Amines will knock it out by using good technique, but esters will knock it out nomatter what.

2-4 D is the most common ingredient of most common 3-way or 2-way herbicides. Check the label to see.

Also, spraying when it's warm & humid works really great! Of course that's not always possible. We prefer using 2-4 D plis Trichlopir (Chaser).