When To Apply Crabgrass Preventer In Michigan

Now is the time to prevent crabgrass kevin frank michigan state university extension department of plant soil and microbial sciences april 28 2014 although spring has been very slow to arrive models indicate many areas of michigan are now in the optimum application window for preemergence herbicide applications. When the soil temperature rises above 50 degrees fahrenheit which is about the time the first flowers and bushes start to bloom crabgrass seeds begin to germinate. Because crabgrass sets seed throughout the growing season it s worth the effort to apply a pre emergent herbicide to prevent any late season released seeds from germinating.

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Crabgrass germinates fairly early in the spring.

When to apply crabgrass preventer in michigan. I did read that last year the crabgrass didn t germinate till mid may but that was unusual. Post emergent herbicide products control crabgrass after it has already germinated. The best treatment for annual bluegrass and crabgrass is a crabgrass preventer a pre emergent herbicide that combats grassy weeds and can be applied in spring or fall. Crabgrass preventer should be applied when soil temperatures reach 50 to 55 degrees fahrenheit.

Scotts halts bayer and ortho lawn weed killers recommend this timing. In the south you will need to apply a crabgrass preventer earlier than in the north. Exactly when do you put down a crabgrass preventer. May 1 is the average time for application of crabgrass preventers in the northern u s.

Initial emergence typically occurs when the soil gets to be about 55 f and the majority of crabgrass seeds germinate between 60 f and 70 f. That s the right time to apply scotts halts crabgrass preventer which contains the herbicide pendimethalin. Apply your crabgrass preventer before soil temperatures reach over 55 degrees for 3 days. I think i will stick to the by the end of march theory.

If you apply the herbicide too early in the spring it may break down before the end of the. The best timing for applying crabgrass pre emergent is when the soil temperature is between 50 f and 55 f just before the onset of rains this prevents germination of crabgrass weeds in your lawn. Apply crabgrass preventer early enough in spring. And canada but the ideal time will vary depending on where you live and how warm a spring you are having.

I believe the preventer works for about a month so i think we are all safe. Read and follow the manufacturer s directions on the product carefully. Forsythia bush on msu s campus in the very early stages of bloom taken march 13 2020. Blooming forsythia bushes are a good environmental indicator for preemergence timing.

Crabgrass seeds start to germinate as the soil warms up. When is the correct time to apply crabgrass preemergence herbicides in an early spring. Post emergent herbicides work by killing the crabgrass plants. Loon i usually use scotts but this time i happened to be at meijers and they only had the meijers brand.

Apply these herbicides only to the crabgrass that is visible.