911311, not all Flying Dragon seed are true to type. Approximately only 50 percent of Flying Dragon seed will produce true to type, no matter the age of the mother tree. Flying Dragon as a cultivar always has zigzag stems and strongly curved thorns. It is an easy way (without a DNA test) of selecting predominantly true clonal FD seedlings, while discarding those which are obviously and definitely genetically different. All straight stemmed and straight thorn are not FD.