Perennial Sweet Pea: How to Grow, Care for, and What to Expect

The perennial sweet pea, often called the everlasting sweet pea, is a tough, reliable climbing plant that comes back year after year. While it looks similar to the annual sweet pea, it behaves very differently and is ideal for low-maintenance gardens, fences, and wildlife areas.

⭐ Recommended Products — Sweet Peas & Growing Essentials

Sweet peas are fragrant classics that bring colour and scent to summer gardens — and starting them right gives the best blooms.

• Sweet Pea Seed Mix (Classic & Fragrant Varieties)
A selection of popular and scented sweet pea seeds — perfect for sowing early under cover to produce tall, blooming plants later.
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• Sweet Pea Support Canes & Twine Kit
Strong bamboo canes with garden twine to train your sweet peas up for maximum display and air circulation.
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• Seed & Cutting Propagation Compost
Fine, free-draining compost ideal for sowing sweet peas — helps seedlings get a strong start with healthy roots.
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• Sweet Pea Grow Bags / Small Containers
Great for sowing seeds in pots, cold frames, or greenhouse benches before planting out — gives easy management of early seedlings.
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• Grow Lights or Heat Mat for Seed Starting
Provides extra light and warmth during early sowing if your natural light is limited — helps sweet peas germinate reliably.
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This guide explains what perennial sweet peas are, how they differ from annual types, and how to grow them successfully.

🌸 What Is a Perennial Sweet Pea?

The perennial sweet pea (Lathyrus latifolius) is a hardy perennial climber. Unlike annual sweet peas, it:

• Returns every year from the same root system
• Dies back in winter and reappears in spring
• Requires very little ongoing care once established

It produces large numbers of pea-shaped flowers in shades of pink, white, and mauve throughout summer.

⚠️ Important Difference: Scent

This is crucial to know:

👉 Perennial sweet peas are NOT scented.

If fragrance is important, grow annual sweet peas instead. Perennial sweet peas are grown for coverage, colour, and reliability, not perfume.

🌱 Where to Grow Perennial Sweet Peas

Sunlight

• Full sun to light shade
• Flowers best in full sun

Soil

• Well-drained soil
• Tolerates poorer soil better than annual sweet peas

Position

• Fences
• Walls
• Trellis
• Arches
• Hedgerows

They are excellent for wildlife-friendly or natural-style gardens.

🌱 How to Plant Perennial Sweet Peas

Planting from Plants or Roots

• Best planted in spring or autumn
• Dig a hole and lightly improve soil with compost
• Plant at the same depth as in the pot
• Water well until established

Growing from Seed

• Sow seeds in spring
• Soak seeds for 12–24 hours before sowing
• Germination can be slower than annual sweet peas

🌼 Supporting Perennial Sweet Peas

Perennial sweet peas are vigorous climbers and need strong, permanent support:

• Trellis
• Wire fencing
• Garden arches
• Pergolas or posts

Once established, they will climb unaided each year.

✂️ Pruning & Maintenance

• Cut back dead growth in autumn or early spring
• Remove tangled or weak stems
• Little pruning needed once established

Plants die back in winter and regrow strongly in spring.

💧 Watering & Feeding

• Water regularly during the first growing season
• Once established, they are drought tolerant
• Feeding is rarely needed, but a spring mulch helps

🌸 Perennial vs Annual Sweet Peas

Final Thoughts

Perennial sweet peas are perfect if you want a low-effort climbing plant that provides reliable summer colour year after year. While they lack fragrance, they make up for it with vigour, toughness, and longevity.

For scent and cut flowers, choose annual sweet peas. For long-term coverage and minimal work, perennial sweet peas are an excellent choice.