Daylillies, Iris and a few other perennial flowers in my yard leave less-than-attractive foliage behind. Last year, I left it and it looked yucky until this spring, when I put down pinestraw. Do you guys typically cut the foliage back? I thought I read somewhere that cutting it could affect the growth of the flower the following year? I want to neaten things up and am getting pretty tired of seeing the straggly remains sticking out or laying there but I don't want to do any damage.