Plant goldenrods and your summertime garden will wind down in a blaze of glory. S. rugosa 'Fireworks' has arching wands covered with bright yellow flowers, as if they were the sparkling trail of a rocket. 'Goldenmosa,' a Solidago hybrid, produces erect bouquets. Goldenrod is often blamed for triggering hay fever, but that blame really goes to ragweeds (Ambrosia species), which bloom about the same time.
Most goldenrods grow 1½
-3 feet tall and about 2 feet wide. S. gigantea, or giant goldenrod, towers up to 7 feet tall. Prefers full sun to light shade; moderate water. Perennial in zones 3-9