Ridgetop
Herd Master
You might try digging out your favorites that he cut down. Wrap them in moist newspaper and put them in the fridge for a couple weeks, then try planting them again. Maybe he did not kill them completely, and by refrigerating them you can trick them into dormancy again. Planting them outsiide in a month maybe they will wake and put out shoots. Worth a try if your knees can take it.