Many wild species and cultivars bloom from March to April in the Northern Hemisphere. Wild species, even if they are the same species, are genetically different from one tree to another, so even if they are planted in the same place, there is some variation in the time when they reach full bloom. On the other hand, cultivars are clones propagated by grafting or cutting, so each tree of the same cultivar planted in the same place is in full bloom and scattered all at once.