Black Roses require full sun to develop the dark color, but they will tolerate partial sun. They prefer well-drained soil with a slightly acidic pH of about seven and are drought-tolerant. They bloom yellow flowers in the winter and provide a colorful display in the garden, in a container, or a sunny window. Black Roses thrive in U.S. Department of Agriculture plant hardiness zones 9 through 11 and container plants can be kept outdoors year-round.
Water Black Roses deeply until the water drains through the bottom of the container about once a week from spring to fall. Allow the soil to dry until it's slightly moist at the root level between waterings. During the winter, reduce watering to once a month. Black Roses planted in the ground require less watering than container plants, so feel the soil a few inches down near the roots to check for moisture. If it feels completely dry, water deeply.
Fertilize with water-soluble 10-10-10 fertilizer diluted to half-strength once a month from May through September.
Spray Black Roses with insecticidal soap or neem oil thoroughly at the first sign of aphids or pests. Repeat this weekly until the pests are gone.
Repot Black Rose every two or three years in an unglazed terracotta pot that's slightly larger than the diameter of the plant. Loosen the plant carefully from its pot by grasping the base of the stem, and shake off excess media from the roots. Trim off any damaged or rotting roots with scissors or pruning shears completely.
Fill a pot with fresh well-draining potting mix or a homemade mix, leaving room for the roots. Set the plant in the pot, and lightly pack the potting mix around the base of the stem. Water the plant, and place it in a sunny location.
Growing Black Rose from cutting is the fasted method. It also allows gardeners to make duplicates of succulent plants that are already in the garden, as the Black Rose clipping has the same characteristics as the parent plant.
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