Scott from Chicago Suburbs writes
I have crabgrass intertwined with daylily roots.
Ortho Grass B Gon Garden Grass Killer is only labeled for grasses. However, the label states "Spray directly as possible on to the grass. If some of the spray were to get on the plants, immediately wash off with water. The plants are usually tolerant although there may be temporary discoloration."
Answer last updated on: 11/05/2020