There isn't really a feature here called "Ask Douglas Justice", as Douglas reads all the postings anyway, but Joseph Lin sent Douglas one email with several unrelated questions, and the replies were interesting enough that I'm copying them here, and I wanted a title that indicated that these were educational tidbits and they're not my own. Q: Does any wild (Japanese) flowering cherry with 5 petals produce cherries? Douglas's reply: All wild cherries should produce fruits, but some cherries have a complicated pollination biology. A good example is the sweet cherries. Certain cultivars require pollen from specific cultivars. Bing, for example, requires pollen from cultivars that are cross compatible (such as Van or Rainier). Some cherries are self-compatible (don't need a different pollinizer). Presumably, in a large group of different kinds of flowering cherries (flowering at the same time), we should get at least a few cherries forming.