Hoping someone can answer a question about this bugbane plant. It had 2 false starts this year...both times newly emerged growth got knocked back completely by harsh cold snaps, the last one in early June. I haven't seen any new growth emerge in almost a month. What's the likelihood that the whole plant is dead? Is it possible that it's just given up trying this year and may come back next year? I don't know enough about how plant roots might be affected, if at all, by premature foliage dieback and any suggestions would be much appreciated.