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Do Sweet Peas Come Back Every Year? | UK Gardening Guide
?? Introduction: Perennial or Annual?
Sweet peas are a cottage garden favourite in the UK, known for their fragrance, colour, and climbing habit. But if you’ve planted sweet peas before, you may be wondering—do they come back year after year? The answer depends on the type of sweet pea you’re growing.
? Annual vs Perennial Sweet Peas
1. Annual Sweet Peas (Lathyrus odoratus)
- Most common in UK gardens
- Grown from seed each year
- Flower for months, especially with regular deadheading
- Do not return the following year (unless they self-seed)
✅ Best for fragrance and variety of colours
2. Perennial Sweet Peas (Lathyrus latifolius)
- Often called Everlasting Sweet Peas
- Come back each year from underground roots
- Less scented than annual types
- Hardy and vigorous—can spread over time
✅ Best for long-term coverage, such as fences or arches
? Will My Sweet Peas Return Next Year?
| Type | Comes Back Next Year? | Notes |
|---|---|---|
| Annual (odoratus) | ❌ No – dies after flowering | May self-seed in mild areas |
| Perennial (latifolius) | ✅ Yes – returns each spring | Cut back in autumn or late winter |
? Self-Seeding Possibility
In milder parts of the UK, annual sweet peas can self-seed if you leave a few seed pods to mature.
However:
- New plants may not look exactly like the original
- Germination depends on winter conditions and soil exposure
- It’s more reliable to re-sow each year for best results
?️ How to Ensure Sweet Peas Bloom Every Year
- Annual Type
– Save seeds at the end of the season
– Sow in autumn or early spring indoors
– Transplant outdoors after last frost - Perennial Type
– Plant in well-drained soil with support
– Cut back in late winter or early spring
– Divide every few years to rejuvenate
? Benefits of Growing Perennial Sweet Peas
- Low-maintenance once established
- No need to sow each year
- Strong climbing habit
- Hardy in most of the UK
? Great for long-term garden structure
✂️ Should You Deadhead Perennials?
While not essential, deadheading perennial sweet peas can extend flowering and stop them from setting too much seed, which helps redirect energy into growth.
? FAQs – Do Sweet Peas Come Back?
1. Will my sweet peas grow again next year?
Only if they’re perennial or self-seed. Annual varieties usually don’t return.
2. Are sweet peas perennials or annuals?
Most sweet peas sold in the UK are annuals. Only a few are perennial.
3. How do I know which type I’ve got?
If they’re highly fragrant and grown from seed, they’re likely annual. If they have little scent and came as a plant, they may be perennial.
4. Can I save seeds from annual sweet peas?
Yes—let pods dry on the plant and store seeds in a paper envelope.
5. Do perennial sweet peas flower all summer?
They typically flower from June to August, but less heavily than annuals.
6. Will cutting back perennial sweet peas help?
Yes—cut back old stems in winter to encourage new spring growth.
7. Can I grow both types in one garden?
Absolutely! Mix them for scent, structure, and year-round beauty.
? Conclusion: Annual Beauty, Perennial Promise
Annual sweet peas dazzle with scent and colour but need sowing every year. Perennial types return reliably each spring, offering long-term coverage with less fragrance. To enjoy sweet peas every year, choose the right type for your space—or grow both!