dahlias got frostbitten on tops even tho they were covered
I covered by dahlias the other night, they're about 1-1/12 foot tall and the tops got frost bit anyways. The tops of the leaves are blackened down about 4 inches and I don't know what to do at this point. They are the dinner plate variety and this is my first year in dealing with them so any suggestions will be appreciated in advance. Thanks!