Good Morning M., I checked on www.pallensmith.com
and found some information. Not sure what type of grass you have, we have pamas grass in our wild flower garden.
This is part of what the site says: Description
This grass grows in clumps with the blades remaining short, under 24", and vertical flower plumes that emerge early in the summer.
Planting tips
When planting ornamental grasses make sure the bed or container is deeply cultivated, at least 36 inches, to give the root systems room to grow down. Newly planted ornamental grasses need 1 inch of water weekly for the first growing season. After that they can be quite drought tolerant. Compost or humus is the only soil amendment needed. In later winter or early spring cut back dead growth and apply a slow release, all purpose fertilizer. This is a good time to divide overgrown clumps as well.
Our Pamas grass does grow in clumps so it's easy to see where to dig to remove or transplant. But according to this site now is the time to cut and transplant.
God Bless and Good luck with your grass's. I love spring time
K. Nana of 5