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Plants are perennial in the native habitat, up to 4 m tall with orange or red flowers (in cultivation only 0.8 to 1.5 meters). In USDA zones cooler than Zone 10 it is an annual. Leaves, despite the epithet, are deltoid to lanceolate, occasionally lobed (or broadly heart-shaped) up to 38 cm long and 30 cm wide, with subentire, crenate or serrated margin. The lower ones are usually three-lobed. The petiole is up to 40 centimeters long. The upper side of the leaves is gray, the underside is hairy.