Last summer I had gotten 4 snow in summers to place by the side of my house inbetween the house and driveway. I loved the slvery foliage and its fira t blooming season was amazing. However after blooming the base foligage is looking yellow and it is moee of a fallen down mat than the spiky growing foliage than before. I was wondering if more foliage will grow where it has fell over and exposed the yellow bottoms or if pruning is suggest.