Rex from Bee Branch, Arkansas writes
Trimec Southern Broadleaf Herbicide will not harm your lawn in those temps and especially as long as your turf is listed on the product label as tolerant to the product. The biggest concern with herbicides is making sure you are not applying it when temperatures are too hot or over 85 degrees. Keep in mind that post-emergent herbicides such as Trimec will be most effective when the target weeds are young and actively growing, so you would see limited results, if any, when temperatures are less than 60 degrees.
Answer last updated on: 03/20/2016