This genus contains only three species, all being magnificent trees for parks and large grounds. To grow well, they should have a deep, soft moist soil and a well-sheltered site, preferably a river bottom where their roots may easily reach perennial waters.

Propagate by seeds; the seeds are contained in round balls which must be broken to free the seeds. Sow in February, one-eighth of an inch deep in a shady place, and keep them well watered until they germinate; transplant them to nursery rows when they are one year old.