Tree Indiana Native Populus deltoides [Eastern Cottonwood] Populus deltoides is a large, fast-growing tree that is not generally advised for use in the landscape. This plant is weak-wooded, weedy, and a litter problem, dropping twigs, flowers, branches, leaves, and fruits (the cottony masses that float through the air in early summer). In the wild, it tends to grow along streams, rivers, and other moist areas. Susceptible to many pests and diseases, especially canker.