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This brand new cultivar arose from the bold and vigorous 'Matrona.' 'Black Jack' has the excellent size and habit of its predecessor but with intensely dark-purple, almost black, foliage. The profuse pink blossoms are held on eight inch wide flowerheads in late summer. Upright stonecrops are useful nearly year round: mounds of succulent new growth in early spring, structural upright clumps through summer, heads of showy flower heads in late summer and fall, and dried flower stems in winter.