Q.Applying Weed Preventative
New England, when’s the best time to apply weed control(crabgrass)

Certified GKH Gardening Expert
A pre-emergent for crabgrass will be applied at this time. Since they are a warm season grass, it iw best to apply the season right before they start to grow.
These articles will offer some useful information:
https://www.gardeningknowhow.com/plant-problems/weeds/pre-emergent-herbicides.htm
https://www.gardeningknowhow.com/plant-problems/weeds/weed-control.htm
https://www.gardeningknowhow.com/special/organic/cornmeal-in-the-garden.htm
https://www.gardeningknowhow.com/special/organic/using-sugar-to-kill-weeds.htm