They are about 3-4 inches in diameter and grow in clusters at the end of erect, branching stems. This sunflower grows from swollen, fleshy roots similar to tubers. Plant them in full sun to partial shade and 18-24 inches apart for good air circulation. It is best to purchase named cultivars as seed often results in many inferior plants. Wait until night temperatures are above 50 degrees before planting.
Perennial sunflowers are attractive as vertical accents and in borders.
They provide attractive foliage all season and are wonderful sources of cut flowers in late summer and fall. Water deeply but infrequently to encourage deep roots and strong stems. The tallest varieties may need staking. There are few serious pests, but be on the watch for signs of mildew. A handsome workhorse perennial belonging to the Daisy family, native to open meadows in the United States.