A beautiful perennial producing velvety, chocolate scented, dark-burgundy, almost black flowers over dark green foliage from June to September. Height 60cm. Spread 40cm. Full sun. Moist, well-drained soil.
Cosmos atrosanguineus ‘Black Magic’ is a stunning perennial prized for its velvety, dark-burgundy, almost black flowers that exude a rich chocolate scent. Flowering from June to September, this elegant plant adds a touch of sophistication to garden borders and containers. With the right care, Cosmos atrosanguineus ‘Black Magic’ will thrive, producing an abundance of blooms throughout the summer.
PLANTING and AFTERCARE GUIDE
Best Planting Time
Spring: The ideal time to plant Cosmos atrosanguineus ‘Black Magic’ is in spring when the risk of frost has passed. This allows the roots to establish before the flowering season begins.
Autumn (for tubers): If planting tubers, place them in well-drained soil in early autumn. Protect them from extreme cold to ensure healthy growth in the following spring.
Site Selection
Sunlight: Cosmos atrosanguineus ‘Black Magic’ thrives in full sun. Choose a location that receives at least six hours of sunlight daily for the best flowering results.
Soil: Well-drained, moist but not waterlogged soil is essential. Incorporate organic matter such as compost or well-rotted manure to improve soil structure and fertility.
Planting Instructions
Prepare the Planting Hole: Dig a hole twice the width and the same depth as the root ball or tuber.
Improve the Soil: Mix in compost or organic matter to enhance drainage and boost nutrients.
Planting: Place Cosmos atrosanguineus ‘Black Magic’ in the hole, ensuring the crown is level with the soil surface.
Backfill & Firm: Gently fill in the hole, pressing the soil down to remove air pockets.
Water Thoroughly: After planting, water well to help the plant establish. Ensure the area drains well to prevent root rot.
Watering Requirements
Growing Season: Keep the soil consistently moist but not soggy. Water regularly during dry periods, ensuring deep watering rather than frequent light watering.
Dormant Season: Reduce watering in late autumn and winter, especially if the plant is in the ground, to prevent excess moisture from causing rot.
Feeding
Spring & Early Summer: Apply a balanced liquid fertiliser every 2–3 weeks to encourage vigorous growth and continuous flowering.
Mid-Summer Boost: A high-potassium feed (such as tomato fertiliser) can enhance flower production.
Pruning & Deadheading
Deadheading: Remove spent flowers regularly to encourage more blooms. This also helps maintain a tidy appearance.
Autumn Pruning: In colder regions, cut back the plant after flowering and lift tubers for overwintering indoors.
Mulching & Winter Care
Mulching: Apply a layer of mulch around the base in autumn to protect roots from cold temperatures. Use organic mulch such as bark chips or straw.
Overwintering: In areas with harsh winters, dig up the tubers after the first frost, store them in dry compost, and replant in spring.
Supporting the Plant
Staking: Cosmos atrosanguineus ‘Black Magic’ generally has strong stems, but taller plants may benefit from light staking to prevent wind damage.
Final Tips
Cosmos atrosanguineus ‘Black Magic’ is a low-maintenance, long-flowering perennial that enhances any garden with its dark, chocolate-scented blooms. By planting in full sun, keeping the soil moist but well-drained, and following a simple care routine, this elegant plant will reward you with a summer-long floral display. Whether in borders, containers, or as a cut flower, Cosmos atrosanguineus ‘Black Magic’ is a standout choice for any gardener looking to add depth and drama to their outdoor space.
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