Sweet Pea ‘Cupani’: The Original Heirloom Sweet Pea Explained

Sweet pea ‘Cupani’ is one of the most historically important sweet peas you can grow. It is widely recognised as the original sweet pea, first recorded in cultivation in the late 1600s. Gardeners grow Cupani mainly for its exceptionally strong fragrance, rather than for large or frilled flowers.

⭐ 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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If scent and heritage matter more to you than show-bench perfection, Cupani is an outstanding choice.

🌸 What Is Sweet Pea ‘Cupani’?

Cupani is a heritage (heirloom) annual sweet pea believed to be the first sweet pea introduced to Europe from Sicily in 1699. Nearly all modern sweet peas are descendants of this single variety.

Key features:

• One of the strongest-scented sweet peas available
• Distinctive bi-colour flowers
• Reliable, vigorous growth
• Traditional, simple flower form

Cupani predates modern breeding, so it lacks ruffled petals and extra-long stems—but makes up for it with scent and character.

👃 Why Sweet Pea ‘Cupani’ Is So Famous

Cupani is often described as the benchmark for sweet pea fragrance.

• Deep, rich, old-fashioned perfume
• Strongest scent in warm weather and early morning
• Excellent for cutting and bringing indoors

Many gardeners grow Cupani alongside modern varieties purely to enjoy its scent.

🎨 Flower Colour and Shape

Cupani flowers have a striking, classic look:

• Upper petals: deep purple
• Lower petals: rich maroon or wine-red
• Smaller, simpler blooms than modern hybrids
• Shorter stems than Spencer varieties

The dramatic colour contrast gives Cupani a bold, traditional appearance.

🌱 How Tall Does Sweet Pea ‘Cupani’ Grow?

• Typical height: 1.8–2 metres (6–7 ft)
• Vigorous climbing habit
• Needs support such as canes, trellis, netting, or arches

Despite being a very old variety, Cupani is strong and dependable.

🌱 How to Grow Sweet Pea ‘Cupani’

Cupani is grown in the same way as other annual sweet peas but responds especially well to traditional growing methods.

When to Sow

• October–November (best for strong plants and early flowers)
• January–March (most common and reliable option)

How to Sow

• Sow seeds 2–3 cm deep
• Use deep pots or root trainers
• Grow in a bright, cool position

Soaking seeds for 12–24 hours before sowing can help speed germination.

✂️ Pinching Out (Very Important)

Pinch out seedlings when they reach 10–15 cm tall:

• Remove the growing tip just above a leaf joint
• Encourages bushier plants and more flowering stems

Heritage varieties like Cupani benefit greatly from pinching out.

🌿 Planting Out

• Harden off plants for 7–10 days
• Plant out in April–May, once frost risk has passed
• Choose a sunny, sheltered position
• Improve soil with compost or well-rotted manure
• Space plants 20–30 cm apart

Put supports in place before planting.

💧 Watering and Feeding

• Water regularly, especially in dry spells
• Keep soil consistently moist
• Feed weekly with a high-potash fertiliser once flowering begins

Avoid nitrogen-rich feeds, which encourage leaf growth instead of flowers.

✂️ Picking Flowers (Essential)

To keep Cupani flowering:

• Pick flowers every 2–3 days
• Never allow seed pods to form

If seed pods develop, flowering will stop quickly.

🌸 Flowering Period

• First flowers: Late May–June (depending on sowing time)
• Main flowering: June–July
• Can continue into August with good care

Cupani may flower for a slightly shorter period than modern hybrids, but its fragrance more than compensates.

🌼 Cupani vs Modern Sweet Peas

Final Thoughts

Sweet pea ‘Cupani’ is a must-grow variety for gardeners who value scent, history, and traditional plants. While it doesn’t have the huge, frilled blooms of modern sweet peas, it delivers an intense fragrance and a direct link to sweet pea history.

If you want to experience sweet peas as they were first grown over 300 years ago, Cupani is the variety to choose.