Irving from Phoenix, Az writes
I wanted to spray a late spring early summer pre-emergent.... I forgot to spray one early in the season but wanted something to protect through sept or oct but I live in Phoenix and this week, end of May will be 100-102 degrees. Is it still safe or smart to put down a pre-emergent?
Dimension 2EW is a pre-emergent herbicide, so it is best applied before soil temperatures reach those that are optimal for the weeds you are targeting. This is generally before soil temperatures reach 55 degrees in the Spring. You should not apply when there is snow on the ground or temperatures are below freezing. In the Fall, you would want to apply before soil temperatures cool to those favorable for these weeds, usually below 70 degrees. We recommend contacting your local Cooperative Extension for the best recommendation on timing in your area. Over 100 degree weather will be too hot/late to apply a pre-emergent.
Answer last updated on: 05/30/2018
