I’ve always went by 5 day average.

 

That's kind of what I assumed, but wasn't sure!

 

Yeah, I always use the 5-day average

 

I agree. Peak temp at the hottest part of one day probably won't do much.

How many days does crabgrass seed take to germinate, though?

 

About a week with ideal conditions.

Id lay some pre-M a week before rising temps or right when it hits 50 degrees for the soil. Better to be too early than late.

 

See 30:07 here:

Agrees with what everyone here said. But note this is specific to crabgrass.

 

Heads up for you guys up north, the forsythia is in full bloom in Central NC. This is the earliest I have ever seen this happen.

 

tulips popping at my house....south jersey........


Prodiamine spray went down yesterday.


i have it written down right here...last year--which was also early----3/7 spray....

this year not even 1 snow. NUTZ

 

And temps will continue to be above normal.

 

This is also why you use pre emergent in the fall to take you into spring. Less worries.

 

Lawd. Thank YOU for posting ^that^

 

Here in Kentucky I also look for the forsythia to bloom and also have my Pre-M on hand. Once I see the forsythia start to bud out I hit a half rate down. Then another app several more weeks later.

My old neighbor (passed away now) who had an awesome lawn and beautiful garden he always said as long as you get your Pre-M down before the dandelions puff out you would be okay.

 

Not waiting any longer, threw down 6-month application of prodiamine. Looking at my temps, bare soil low 50's, with a few 65F days ahead. Rain in forecast, taking advantage of it not. I am much more worried about the end of the pre-emergent effectiveness than the start of it. Doing overseed and also full renovation of front yard, right at Labor Day weekend.