I have some hosta plants that are getting quite large and are crowded where they are located right now. What do I need to worry about when moving/splitting hostas?
Don't know if this is the best technique but here is what I did and it worked :)
Go all around the clump pushing in a shovel as far as it will go. You should now be able to pry/lift the plant out of the hole with the root/dirt ball intact. Work the shovel down between the plant stems to slice/pry them apart trying to keep as many of the roots attached to their stems as possible. I divided the root ball into quarters leaving a generous clump (5-10) of stems with lots of roots still attached for planting.