Tophat begonias are like wax leaf begonia on steroids--bigger leaves, bigger flowers, exceptional vigor. They are best in shade or part sun. (Although tolerant of heat and full sun, we think they do best with at least some shade during the hottest part of the day.) They grow 16-20" tall and wide. Like other begonias, they flower all summer without deadheading.
Let soil dry just a little between waterings.
Tophat begonias do well outdoors in containers and beds and even make good houseplants.