Sunflower
Helianthus annuus
Fast-growing half-hardy annual grown for bold summer flowers and edible seeds. Sow under cover or direct outside once the risk of frost has passed, then give plants a sunny, sheltered spot and steady watering while they establish.
Growing Guide
Step-by-step instructions for growing Sunflower
Planting Calendar
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Sow Seeds
Sow seeds around in small pots or modules, or direct where they are to flower in mild areas. Sow seeds to a depth of and keep the compost just moist while they germinate.
Harden Off Seedlings
From to , move seedlings outside for longer spells each day so they adjust to wind and sun. Keep them sheltered from hard frost and check the compost so the roots do not dry out.
Plant Out
Plant out from once the soil has warmed and the risk of frost has passed. Space plants apart, water them in thoroughly, and use fleece or a cloche if cold nights are still forecast.
Support Young Plants
From to , fit a cane or stake beside tall plants before they become top-heavy. Tie stems loosely with soft twine and keep the base weed-free so the roots can spread.
Deadhead & Maintenance
From to , remove fading flowers regularly so the plant keeps producing new blooms instead of putting energy into seed. Water during dry spells, and keep picking off spent heads until the autumn frosts slow growth.
Companion Plants
Tap a plant to see why it works (or doesn't) with Sunflower.
Good companions
Plants to avoid
Why companion planting matters
Companion planting can deter pests, improve pollination, and make better use of space. Some plants confuse pests or attract beneficial insects; others improve soil or offer shade to neighbours that need it.
Suggested Varieties
Popular varieties of Sunflower to consider
Russian Giant
Tall, classic single yellow flowers with large heads for cutting and seed.
Mongolian Giant
A very tall variety with broad leaves and large flower heads, good for a bold display.
Teddy Bear
A dwarf, double-flowered type with soft, shaggy blooms for pots and smaller gardens.
Autumn Beauty
A mixed-colour variety with branching stems and several medium-sized flowers on each plant.
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Brussels Sprouts
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Calabrese
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