Sun/part-sun in moist, well drained soil. Good heat tolerance.
Elms are loved for their graceful, stately shape, with branches like spreading fountains, and green leaves that turn gold in fall. American elm is vulnerable to Dutch elm disease, but typically achieves significant size before it succumbs, and meantime it hosts over 200 lepidoptera species in our area, and once it dies, it provides other wildlife services as a dead snag, which are becoming increasingly unusual, and there are many different types of wildlife that benefit from dead trees left standing. By some estimates, the removal of dead material from forests can mean a loss of habitat for up to one-fifth of the animals in the ecosystem.
There is also benefit in keeping elms bushy by trimming them (but not in the months of April - August when the Dutch elm fungus is most active since it is attracted to cut wood) back and selecting for bush-type growht. This brings caterpillars that would otherwise be impossible to enjoy from their perch in the canopy.
The biggest lesson learned from the devastation of Dutch elm disease is the importance of having a variety of trees along streets, in parks, and in home landscapes so that no disease or pest that may arrive can kill a large proportion of the trees.