Cottonwood is a tree people love to hate. This fast-growing poplar grows throughout North America, except in the far western states and mountains.It grows quickly, 4-6 feet per year,into a nicely-shaped shade tree, with large, glossy heart-shaped leaves. Once established it tolerates poor soils and varying moisture levels. In dry plains, groves of cottonwoods sprout along streams, and may provide the only shade for miles around. In spring, it produces racemes of cottony seeds that fill the air with fluff that settles on the ground - and in air conditioning units. Seedlings readily sprout in every moist area they land. On windy days, brittle branches litter the ground. If you pick them up, you will find that the buds are sticky. In autumn, the leaves turn a blotchy yellow and are quick to drop. Seedless cultivars are available.