That's Red Yucca. Hesperaloe is a variety of red Yucca but not the one you have.
I think you need to dig up the entire clump, thin it, replant some, and give the rest away. You could also try reaching into the clump and pulling up individual plants at their base. Might work.
I think you need to dig up the entire clump, thin it, replant some, and give the rest away. You could also try reaching into the clump and pulling up individual plants at their base. Might work.










