Hi there: I assume this is a gymnosperm. Move it if I'm wrong. I have this thing--I don't know what it is--in a flower bed (planted by previous owner). It's about 2' tall and growing in a mounded shape. It's taking over the bed and spreading in all directions like the blob. I'd like to cut it back to something smaller, but I don't know how. When I look underneath it appears to be a million thin brown stems, but no central trunk. I also know that if I'm not careful I'll wind up with something that has brown edges that will not regrow any green. Advice please?