Growing Sweet Peas in Pots: A Complete Guide

Sweet peas grow very well in pots, making them perfect for patios, balconies, courtyards, and small gardens. With the right container, compost, and support, you can enjoy tall plants, strong scent, and plenty of flowers even without open ground.

⭐ 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.
👉 Click here to see top options

• Sweet Pea Support Canes & Twine Kit
Strong bamboo canes with garden twine to train your sweet peas up for maximum display and air circulation.
👉 Click here to see top options

• Seed & Cutting Propagation Compost
Fine, free-draining compost ideal for sowing sweet peas — helps seedlings get a strong start with healthy roots.
👉 Click here to see top options

• 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.
👉 Click here to see top options

• 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.
👉 Click here to see top options

This guide explains how to grow sweet peas in pots successfully, step by step.

🌸 Can Sweet Peas Grow in Pots?

Yes—sweet peas thrive in pots as long as they have:

• Deep containers for their roots
• Rich compost that stays moist
• Strong supports for climbing
• Regular watering and feeding

They are often grown in pots for cut flowers and decorative displays.

🪴 Best Pot Size for Sweet Peas

Sweet peas have long roots, so depth matters more than width.

Recommended container size:

• Minimum depth: 30–40 cm
• Minimum width: 30 cm
• Plants per pot:
  • 3–4 plants in a large pot
  • 1 plant per deep container or root trainer

Avoid shallow pots—they lead to weak growth and poor flowering.

🌱 Best Compost for Sweet Peas in Pots

Use a nutrient-rich, free-draining compost:

• Multi-purpose compost
• Add extra composted manure or garden compost if available

Good drainage is essential—always use pots with drainage holes.

🌱 Sowing Sweet Peas for Pots

You can sow seeds:

• October–November (overwinter under cover)
• January–March (most popular)
• April–May (direct sow outdoors)

Sow seeds 2–3 cm deep in deep pots or root trainers, then transplant into final containers once established.

🌼 Supports for Sweet Peas in Pots

Sweet peas need strong vertical support:

• Bamboo canes tied into a wigwam
• Trellis fixed inside or behind the pot
• Obelisk or decorative frame

Install supports before or at planting time to avoid root damage.

🌿 Planting Sweet Peas into Pots

1. Fill the pot with compost
2. Position plants evenly around supports
3. Plant slightly deeper than they were in their original pots
4. Firm compost gently and water well

Place pots in a sunny, sheltered position.

✂️ Pinching Out (Very Important)

• Pinch out plants when they reach 10–15 cm tall
• Remove the growing tip above a leaf joint

This encourages bushier plants and more flowers.

💧 Watering Sweet Peas in Pots

Sweet peas in pots dry out faster than those in the ground.

• Water daily in warm weather
• Keep compost consistently moist
• Never let pots dry out completely

Mulching the surface helps retain moisture.

🌱 Feeding Sweet Peas in Pots

Because nutrients wash out of pots quickly:

• Start feeding once flowering begins
• Use a high-potash fertiliser weekly
• Avoid high-nitrogen feeds (too much leaf, fewer flowers)

Regular feeding is essential for long flowering.

✂️ Picking Flowers to Keep Them Blooming

• Pick flowers every 2–3 days
• Never allow seed pods to form
• Frequent picking encourages continuous flowering

Cut flowers early in the morning for best scent and vase life.

🐛 Common Problems with Sweet Peas in Pots

Poor Flowering

• Pot too small
• Compost drying out
• Lack of feeding

Yellow Leaves

• Nutrient deficiency
• Dry roots

Plants Falling Over

• Weak supports
• Too many plants in one pot

Final Thoughts

Sweet peas in pots are easy, practical, and incredibly rewarding. With deep containers, strong supports, regular watering, and weekly feeding, you can enjoy tall plants and beautifully scented flowers even in the smallest spaces.

If you’re short on garden space, growing sweet peas in pots is one of the best ways to enjoy them.