To identify a crabapple tree, look for a tree that is smaller in size with a rounded shape and branches that tend to grow at right angles from the trunk. Crabapple leaves are oval-shaped with a pointed tip, usually about 2 to 4 inches long, and have serrated edges. Crabapple flowers are typically pink or white and appear in clusters in the spring. Crabapple fruit is small, about 1 to 2 inches in diameter, and comes in various colors, including red, yellow, and green.