Trough Gardens-Lewisia-native American West flower late spring-early summer w/pink, rose, salmon, white, cream, or orange blooms distinctively striped. They don't tolerate moisture around their crowns, so mulch with gravel to promote drying. Size: 6-12" tall; 8-16" wide Zones: 4-8 Top Picks: Cotyledon Hybrids lewisia-northern California species-wide range of colors forms. Bitterroot bears solitary pink or white blooms.