Killing veronica/speedwell?

arcas(z6 KY)May 6, 2009

Veronica/speedwell is slowly taking hold in my yard. I've tried pulling it up but it's outpacing me. Seems every other day I pull up about a half-gallon's worth as measured by my weed bucket.

It's time to escalate. So far I've tried both Ortho Weed-B-Gone Max and Bayer Advanced All-In-One weedkiller using a pump sprayer. It seems like speedwell actually thrives on the Ortho spray. If I didn't know better, I'd guess that it contained fertilizer instead.

After several applications of the Bayer spray at the recommended concentration, the speedwell turns slightly yellow but the yellowed plants return to green if I go more than a week between sprays. On a whim, I poured about a tablespoon of Bayer at full strength on a small cluster of speedwell and it indeed killed it but I obviously cannot do this over the entire yard.

My question: what is available to homeowners that can effectively control this weed? I've read that dithiopyr and isoxaben are both effective but I haven't found anything at the local home center or farm store that contains them.

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andy10917(NY 6a)

Products with 8% Triclopyr will work, but it may take as many as 4 treatments to really get it done. Yes, the products that you've used (check them!) have 1.5% Triclopyr in them, but ground ivy and speedwells laugh at that concentration. You'll find that Ortho's Chickweed, Clover and Oxalis Killer as well as Ortho's Brush-B-Gon Poison Ivy Killer both contain the 8% Triclopyr needed. Treatments should be about 10-14 days apart. Stay on schedule - a late treatment will send you back to the starting line (it recovers too much).

    Bookmark   May 7, 2009 at 9:18PM
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I have this same problem and appreciate your advice Andy! I had put on Weed-B-Gone just over a week ago and it didn't do squat. Today, by chance, I went over all of my speedwell with Ortho's Chickweek, Clover and Oxalis Killer. I now have it on my schedule to keep doing it every 10 days or so.

    Bookmark   May 25, 2009 at 9:22PM
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dspake(z5 KS)

Kinda late I know, but I had the same issue, and the same results with WBG. I dug into the topic some and found that mecoprop is about the best type of herbicide you can use on speedwell. Fortunately I stumbled across Speedzone (5.8% or so) of MCPP and it really knocked that speedwell for a loop. After just a couple of days I had upwards of 70% turning brown and withering. By the end of two weeks all the speedwell I had sprayed was dead.

Of course it grows so low to the ground that I've still got some popping up, but I'll get to it. I can definately tell that the lawn likes it because those areas where I've beaten the speedwell back in, the grass is growing much better.


    Bookmark   June 16, 2009 at 9:09PM
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Our very large lawn is being taken over more every year by veronica. I read with interest the spray suggestions, but we have two dogs. Is there anything that can help that will not be harmful to the dogs? ( We have about an acre of lawn )

    Bookmark   April 11, 2010 at 12:47PM
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Is spot spraying the lawn, and then just taking your dogs for a walk in the neighborhood for the next week an option?

    Bookmark   April 12, 2010 at 2:28PM
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