![]() ![]() Crabgrass - one of the big problem weeds in New York and Connecticut lawns - germinates when soil temperatures reach about 55 to 60 degrees for three consecutive nights.Īpply a pre-emergent product after this happens, and it won’t do any good. Weed seeds germinate at varying temperatures. A calendar is actually less helpful than a thermometer, because this is a matter of ground temperature. There’s a fairly small window of opportunity here. When To Apply Pre-Emergent Herbicide To Lawns If you have a history of annual weeds sprouting in your lawn, this kind of weed prevention is for you. The key word here is “pre-emergent.” That means it’s applied to the lawn before grassy weeds can grow. The weed is killed when it begins to sprout from the seed and hits the herbicide barrier. These weed killers target weed seeds before they germinate, so pesky weeds don’t even have a chance to sprout. ![]() How Does Pre-Emergent Herbicide For Lawns Work? Let’s take a closer look at when to apply a herbicide formulation to your lawn as well as how it actually works. But with this kind of weed blocker, timing is everything. That’s where pre-emergent herbicide comes in. They’ll happily take over your pretty green turf, if you let them. And if allowed to spread, weeds get even uglier, competing with your lawn for water, sunlight and important nutrients.
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