Deep chocolates and rich blacks are an unusual color to find within the garden. Once planted, they provide a dramatic and oftentimes unexpected touch to the garden. Found in a wide range of flower types, each with its own distinct shape, size and color, dark flowers are ideal plants to grow within the garden to accent and complement surrounding flowers.
Trillium 'Sweet Beth'
Trillium 'Sweet Beth' (Trillium vaseyi) is a perennial flower that is native to woodlands of North America and bears the largest flower within the genus. It grows 1 to 3 feet tall and has a spread of 6 to 12 inches wide. Sweet Beth has a clumping growth rate and moderate growth pace with flowers that appear just beneath the foliage of the plant. The nearly 4-inch-wide, curved flowers are chocolate or red. They bloom in mid- to late spring. Sweet Beth trillium grows best in part to full shade and well-drained, rich and moist soil that is neutral to acidic in nature. They are suitable to grow in USDA zones 5 to 8.
Chocolate cosmos (Cosmos atrosanguineus), also called black cosmos, are a tuberous-rooted perennial flower that is native to Mexico and begins blooming in early summer and last into fall. They grow up to 3 feet tall and wide and have a moderate growth rate. The chocolate-scented, daisy-like, velvety flowers are dark brown to almost black and attract butterflies to the garden. Each flower sits atop the slender, tall stems that are brown to red. The dark green lance- to oval-shaped foliage on chocolate cosmos is pinnately divided. Chocolate cosmos grow best in full sun and well-drained, moist soil that is fertile. To ensure a long flowering season, deadhead the spent chocolate cosmos as soon as they are noticeable. Chocolate cosmos grow best in USDA zones 7 to 11.
Black pansy (Viola 'Black Accord') is an annual flower that is suitable to grow in all USDA zones. Black pansies grow 8 to 12 inches tall and are ideal tucked along a front flowerbed or nestled within containers for their striking display. The 2- to 4-inch-wide black, flattened "faces" of the black pansy consist of two upper petals, two lateral petals and one lower spurred petal with a contrasting yellow center. The dark green oval- to elliptic-shaped leaves on black pansies grow up to 1 1/2 inches long. Black pansies grow best in full sun to part shade and fertile soil that is consistently moist. To promote a long flowering season, deadhead the spent black pansy blooms as soon as possible.