I have to add about 10 inches of soil around my house foundation to increase the runoff slope but it has had hostas growing there for the last 10 years. Can I just add the dirt over them or do I have to dig them up and replant them shallower?
Thank you for your question.
If you were adding just a couple of inches of soil I would say leave the hosta plants in place, but adding an additional ten inches of soil will bury the plants' crown too deep. Dig up hostas, add soil, then replant.
Hope this helps.