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Maltese Cross The fiery flowers of Maltese cross (Lychnis chalcedonica) appear on 2- to 4-foot stems in early summer. Sow in sun or part shade in moist, well-drained soil, and cut back after flowering to encourage re-bloom. The flowers may also attract hummingbirds.
'Warm Summer' Coneflower produces flowers for bouquets from June through August. It fills a garden bed with warm color -- just sow seeds and enjoy flowers later in the season. Name: Echinacea 'Warm Summer' Growing Conditions: Full sun and well-drained soil Size: 30 inches tall, 18 inches wide Zones: 4-9 Grow It With: Black-eyed Susan Source: burpee.com
Balloon flower: Named for the shape of its buds, this long-lived perennial blooms from mid to late summer. Blue is its most common color, but white and pink selections can also be found. Balloon flower prefers moist, well-drained soil. Once established, it's virtually maintenance free. Don't divide; the fibrous root system can be tricky to transplant. USDA Hardiness Zones: 3 to 8