Fescue Lawn – When Is It Safe To Put Down Liquid Weed Killer?

Q: My new fescue lawn has been growing well and has been cut twice. My landscaper used weed and feed granules but after five days I see no change in the weeds. Is it safe to put down liquid weed killer now? 

A: The usual recommendation is to wait until the grass has been mowed a couple of times before you apply weed killer. This insures the grass is mature enough to avoid damage from herbicide chemicals. Since your lawn is still young, I would use a half-strength weed killer application now. Wait a few weeks to see if a second application is needed.