The cherry birch is one of the most endangered woody tree species in Canada with an estimated five naturally-occurring plants known to exist in Ontario. That’s a paltry number. But there is actually a lessened chance of this botanical beauty dying out, thanks in large part to an innovative program at the University of Guelph. The Arboretum’s living gene bank, which began operation in the mid 1970s, is helping to spare rare trees like the cherry birch from extinction in Canada.