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.
How to Grow Dahlias. Dahlias offer flamboyant flowers on lush plants from summer through fall, right up to the first frost. Fully hardy to zone 8, these hybrids of species native to Mexico and Colombia may overwinter in Zone 7 with a thick blanket of mulch.