Q. I am concerned with the growing number of weeds in my yard. I have tried overseeding in the hopes of crowding out the weeds. Any suggestions would be appreciated.

A. There are many products available for spot-treating weeds once they have emerged. However, there are a few guidelines to follow, especially since you have recently set down grass seed. Apply the product when the weeds are young and actively growing. Do not apply on a hot or windy day, if the turf is stressed due to drought or if rain is expected within 24 hours. Avoid mowing your lawn for a few days before and after application. If you need to use the weed killers in your freshly seeded area, wait until that new grass has grown enough to be mowed three or four times. If you are planning to put down more seed in the area you have treated, wait 30 days before doing so.