Sunflowers grow well across the UK when sown from late March indoors or late April outdoors. Seeds germinate in 7-14 days at soil temperatures above 10C. Dwarf varieties like Teddy Bear (RHS AGM) reach 60-90cm and suit pots. Giant types like Russian Giant grow to 2-3m. Flowering takes 8-18 weeks from sowing depending on variety. Plants need full sun, well-drained soil, and weekly watering once established.
Key takeaways
- Sow indoors from late March or outdoors from late April when soil reaches 10C
- Germination takes 7-14 days — faster at 20-25C on a warm windowsill
- Dwarf varieties like Teddy Bear suit pots as small as 30cm diameter
- Giant varieties need 45-60cm spacing and staking once they pass 1m tall
- Slugs are the biggest threat to seedlings — protect with copper tape or grow in pots until 15cm tall
- Leave seed heads on the plant in autumn to feed goldfinches and other garden birds
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Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.
