Height: 30" Width: 12" Sun: Full sun. Soil Moisture: Well-drained soil. Hardiness: USDA Hardiness Zones 4-8. Culture: Prefers rich soil. Very weather tolerant. Plant in partial shade in warmer zones. Heavy flowers may be staked for neater appearance, however, an interesting free-falling effect occurs without staking. Remove spent flower stems after blooming. Divide in spring every 2 to 3 years.