Purple flower clusters (8 inches long) cover this small tree all summer long. Blooms beckon pollinators of all kinds—it’s a great plant for a bee or butterfly garden. Gray-green leaves have purple undersides that complement blooms. Look for other chaste tree varieties with flowers in shades of pink or white. The branch structure is very architectural and adds good winter interest to a landscape. If your chaste tree develops lots of twiggy growth and starts looking more shrub-like, prune it in late winter. Remove all smaller twigs along five or six major trunks to create a tree-looking plant. Size: 6 to 8 feet tall and 8 to 10 feet wide. Hardy in Zones 6-9.