Most elephantâs ears are perennials and will come back every summer in the Lower, Coastal, and Tropical South. Some are perennials in the lower part of the Middle South.
Dahlias are available in different heights, dwarf dahlias are normally 12 to 18, and the taller dahlias grow 5' to 6'.Dahlias up to 2 ft.ahlias are available in different heights, dwarf dahlias are normally 12 to 18, and the taller dahlias grow 5' to 6'. Dahlias up to 2 ft.
Tips. 1  Wait to plant dahlias until your region no longer has a threat of frost. 2  You can divide dahlia tubers in the spring or fall. 3  When the eyes are difficult to see, it is best to divide the clumps in halves or quarters. 4  You can store tubers in a cardboard box with a lid until spring. Leave enough space between the plants that growing dahlias will not choke one another or steal nutrients from one another. 2  For medium or giant dahlias, leave 2 to 3 feet (.61 to .91 m) between holes. 3  For smaller varieties, leave 2 feet (.61 m) between holes.