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Hollyhock ‘Blacknight’
Hollyhocks, Alcea rosea, stand tall in any garden, with flower spikes growing up to six feet tall. ‘Blackknight‘ and ‘Nigra’ are two varieties with almost black, single-petal flowers.
This perennial flower, hardy in U.S. Department of Agriculture Plant Hardiness Zones 3 through 9, prefers full sun and well-drained soil. Once established, hollyhocks can tolerate some periods of dryness. Stake them in windy areas to keep them from falling over just as they bloom.
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Columbine ‘Black Barlow’
Officially known as Aquilegia vulgris var. stellata ‘Black Barrow,‘ this perennial columbine, aka Granny’s Bonnets, grows up to 18 inches tall. It features dark plum-colored, almost black, double-flowering blooms in late spring. Hardy in USDA Zones 3 through 9, it’s considered a short-lived perennial.
Grow it from seed or purchase plants. If blooms are left to form seeds, it will often self-sow around a garden, but seedlings are easy to pull out where you don’t want them. If growing around other similar columbines with different flower colors, they will cross-pollinate, and seedlings may be any color.
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