Pre-Emergent to put down now for Poa Annua

I use Treflan as a pre-emergent. I use it in my lawn and flowerbeds with a lot of success. I have a Zoysia lawn and have had no problems.

LINK

I personally use granular Dimension (dithiopyr) pre-emergent in the fall and spring. Poa used to be my number 1 problem winter weed - no longer - I’ve eliminated about 90-95% of it using Dimension. Now is the time to apply it.

I’ve virtually eliminated crabgrass with a late winter (mid-Feb) application of Dimension. Now on the other hand, doveweed has become my number 1 summer weed and Dimension does not appear to be very effective against it. I’ll try Barricade pre-emergent to target doveweed next year.

Pre-emergent herbicides such as Dimension or Barricade will have no negative effects applied within the drip edges of trees or flower beds - in fact will provide some benefit - unless you plan some plant some flower seeds or any other plant from seed. One caveat - Atrazine herbicide has both pre-emergent and post-emergent properties - avoid using that herbicide within the drip-line of trees or flower beds as it can potentially harm woody trees and shrubs.

quote:

---

With the Dimension, do you use the concentrate or the granular?

---

I use granular simply b/c it’s more convenient to apply in my residential yard but of course use whatever form you find most convenient for you.