By definition, an apple tree with fruit less than 2 inches in diameter is regarded as a crabapple. In practice, most flowering crabs sold for landscape use have fruit that is about 1/2 inch in diameter or less. Crabapples are generally bred for their spring flowers rather than their fruit. Most commercial apples sold for eating are cultivars of Malus domestica and a handful of other species. Crabapples, on the other hand, are a much more genetically diverse group, including dozens of Malus species and hybrids. So-called weeping crabapples are identified by their relatively small size and the downward-turning growth habit of their branches. Standard apple trees generally have an upward vase-like or spreading shape.