When should I cut back my liriope and ornamental grasses?

Both of these should be pruned in March. It is important that these plants be cut back each year, because they put out new foliage from the ground to replace last year’s growth, which will not rejuvenate itself. When cutting back the larger grasses, make your cut in the shape of a mound instead of straight across. Cutting straight across the top of the plant could lead to the middle of the plant dying out and not coming back.