Cosmos
Airy flowers that keep pollinators visiting the vegetable patch.
Cosmos seeds
£2.49 in the shop
Calendar
Sow
March–April indoors or May outdoors
Plant out
Deadhead frequently; avoid rich soil, which encourages leaves over flowers.
Harvest
July–October
Conditions
Sun
Full sun, at least 6-8 hours a day, for best flowering.
Water
Water regularly, especially during dry periods, keeping the soil moist but not waterlogged. Allow soil to dry slightly between waterings.
Soil
Well-draining, moderately fertile soil. Prefers a neutral to slightly acidic pH (6.0-7.0).
Spacing
French marigolds: 15-20cm; African marigolds: 25-45cm, depending on variety.
Containers
Excellent in pots, window boxes, and borders. Dwarf varieties are particularly good for containers.
Indoors
Can be grown indoors from seed to get a head start, or as temporary houseplants in bright light.
Care and harvest
Feeding
Generally not required in good soil. A light, balanced liquid feed once a month can boost flowering in containers.
Pruning
Deadhead spent flowers regularly to encourage continuous blooming and prevent self-seeding.
Harvesting
Deadhead frequently; avoid rich soil, which encourages leaves over flowers.
Storage
Best used fresh as cut flowers. Can be dried for potpourri or crafts by hanging upside down.
Good companions: Tomatoes, Potatoes, Roses, Asparagus