4 of 5 of my 5-year-old Nanking cherries (grew to >6 ft and produced nice fruit in the past 2 years) are not blossoming this spring. Although the winter in central PA was rather harsh, these plants should be sufficiently cold-hardy. I noticed on the non-blossoming bushes that the bark at the bottom of the trunk has crevasses (see attached picture). Could this be damage by rodents or other physical damage? Is the root system still ok and would cutting back and waiting for new growth work (as works for currants or gooseberries)? Can the wound on the trunk be closed and painted (as with other fruit trees)? Any help will be appreciated.