Euphorbia Blackbird features stunning shades of midnight-purple foliage, as well as contrasting bright red stems and lime-green blossoms. The foliage is by far the darkest yet on any euphorbia, and it keeps this color all season. In spring, bright red stems emerge to support the rounded blooms, held in huge clusters above the foliage. This shrub remains compact and bushy, forming 18- to 22-inch mounds at maturity, making it ideal for providing a dark accent in small gardens. Zones 6 to 10.