Recomended: A southern Great Plains endemic introduced by James Locklear, further promoted by Bluebird Nursery, Clarkson, Nebraska. Silver leaves compliment the clear yellow flowers. Best on well drained sites. Blooms May to frost. Drought tolerant. Perennial. Height: 4 inches. Width: 14 inches. Sun: Full sun. Soil Moisture: Moderate to dry, not too wet. Hardiness: USDA zones 4a-9 (up to 8,000').  Culture: Easy in average Garden soil.