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.
1 Dwarf cannas stay under 3 feet tall and are easy to fit into our downsized modern gardens. The 2-Â½-foot-tall âPicassoâ is a yellow-flowered dwarf peppered with freckles.  Standard varieties grow 4 to 6 feet tall and need a 20- to 24-inch circle for each hand-size rhizome.