Sweet peas (Lathyrus odoratus) grow well across all UK regions. Sow in autumn (October to November) for the strongest plants, or in spring (February to March) for the simplest approach. Autumn-sown plants develop stronger root systems and flower 2-3 weeks earlier than spring-sown. Pinch out the growing tip when seedlings reach 10cm to encourage bushy growth with more flowering stems.
Key takeaways
- Autumn sowing in October produces the strongest plants with the most flowers
- Pinch out the growing tip at 10cm tall to encourage bushy growth and more stems
- Sweet peas need support of at least 1.8 metres — use cane wigwams, obelisks, or netting
- Pick flowers every 2-3 days to prevent seed pods forming and keep plants flowering
- Soak seeds overnight before sowing to speed germination, especially dark-seeded varieties
- Sweet peas are annual climbers that flower from June to September with intense fragrance
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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.
