I’m beginning to panic now about what will have been killed or severely damaged by the freezing temperatures. We healed in the majority of unplanted ornamental woody plants,
so hopefully their roots should be OK. There are however a number of perennials, fruit bushes and trees which are above ground and therefore more vulnerable. Only time will tell.My newly purchased Epimediums are frozen solid in their pots in the greenhouse. It will be very disappointing if they never even grow for one year.