Herbicides such as glyphosate are available to kill the grass, but not harm the tree. The label will indicate if the herbicide is right for the grass you have and whether your particular tree is sensitive to it. ... A cardboard cover will protect the tree so the spray does not get on the trunk or leaves.

Can you use grass killer around trees?

Those containing glyphosate, for example, typically are safe to spray around mature trees. The chemical doesn't leach through the soil, so it shouldn't reach the tree's roots. Sethoxydim, another herbicide active ingredient, also is deemed safe to spray under trees to eliminate grass and weeds.

Does grass killer kill other plants?

Product Description. Ortho Grass B Gon Garden Grass Killer is a ready-to-use, selective, systemic grass killer that can be used to kill existing weedy grasses in and around ground covers, plant beds, landscapes, individual shrubs, and trees. And it won't harm listed landscape plants.