Answer: Any broadleaf weed killer (one containing 2,4-D) will affect your tree so stay away from those products. Probably the safest chemical is one containing glyphosate (Round Up is an example). It is a contact killer and as long as you keep it away from desireable trees and shrubs it won't harm them, but will be effective in killing the weeds - and the lawn, I'm afraid. Glyphosate does not translocate in the soil and it degrades in the presence of sunshine and fresh air. When the weeds are dead, rake them out of the area and prepare the soil for planting.
Q&A Library Searching Tips