By Teo Spengler Washington hawthorn trees (Crataegus phaenopyrum) are native to the southeastern part of this country. They are cultivated for their showy flowers, bright-colored fruit and lovely fall colors. A relatively small tree, Washington hawthorn makes a nice addition to a backyard or garden. Keep reading for tips on how to grow Washington hawthorn trees. Washington Hawthorn Information If you are thinking of growing a Washington hawthorn, you’ll find a lot to love in this native deciduous tree. It offers fragrant spring flowers that attract butterflies and bright fruit called haws that wild birds love. These hawthorns are also lovely in autumn. The green foliage blazes into shade of orange, scarlet, crimson and purple. Washington hawthorn trees don’t get taller than 30 feet (9 m.) tall. Cultivated specimens can be considerably shorter. Those thinking of growing Washington hawthorn will want to know that the branches have large spines, however.