1.   Also, is there any way, short of digging down to China, to get rid of nut grass in my flower beds?

2.   Image is a selective post-emergent herbicide that targets nut grass.

3.   Nut grass likes moist soil with low oxygen movement and little competition from other plants.

4.   What you have to do is take an eyedropper and spot-treat each clump of nut grass.