Best grown in light, well-drained soils with a neutral pH in full sun. Good drainage is the key to growing this plant well. Tends to rot in wet, poorly drained soils. Particularly intolerant of wet soils in winter, and benefits from a light, dry winter mulch. Best performance is in cool summer climates such as the Pacific Northwest. Generally intolerant of high heat and humidity, and does not grow well in the deep South (south of USDA Zone 7). Remove spent flowers to encourage additional bloom.