(Malus baccata) Zone 2-7 ☼ Crab apple is a short shrubby tree that reaches heights of 15 to 25 feet. It is valued for its fruit and flowers. It flowers in the early spring with beautiful white blooms. Many landscapers plant Crab Apple for the beauty of the spring blooms. The fruit is typically yellow in color and is ¼ to ½ inch in size (resembles a pea). The fruit is desired by many songbirds and mammals.