I have 21 rows of lavender (Grosso and Hidcote Blue - approx 1,500 plants) with 3' weed barrier installed in the rows The lavender is planted through a 2" hole at the base. In that 2" hole colonial bent grass has emerged vigorously almost to a point where it is as big as the lavender. Is there an herbicide that my be applied to kill the grass but not harm the lavender? Getting the weed eater out is not an option as it would damage the plant. Advice would be greatly appreciated.
Benton County Oregon