How to Grow Sweet Tasty Peas in Pots?
Grow beautiful, fragrant sweet peas on your patio or balcony with these simple container gardening tips. This guide covers choosing the right pot, planting, support, watering, and feeding for a stunning display. #SweetPeas #ContainerGardening #PatioPlants #FlowerGarden #DIYGarden
The first time I tried growing sweet peas in a pot, I made every mistake possible. I used a tiny container, forgot to add canes for support, and let them dry out on a hot day.
My plants were sad, spindly, and produced about three flowers. I was so disappointed. But the next year, I did my homework. I got a deep pot, built a proper wigwam, and watered them religiously. The result was a stunning display of fragrant, colourful blooms that lasted all summer.
Now I want to share what I learned so you can skip the frustration and grow the sweet peas of your dreams.
Why Sweet Peas Are Perfect for Pots
Sweet peas are among the best climbing annuals you can grow in a container. A single large pot with a wigwam of canes, planted in late spring, will give you armfuls of scented cut flowers from June until September—all from a few square feet of patio. They do need more attention in pots than in the ground, mainly watering, but the payoff is enormous: colour, scent, and a vase on the kitchen table all summer long. Sweet peas grow beautifully in pots as long as you can offer them what they need.
What You Will Need
| Item | Purpose |
|---|---|
| Deep container (at least 30cm across, 40cm deep) | Gives roots room to grow |
| Quality potting mix | Provides nutrients and holds moisture |
| Sweet pea seeds or plugs | Choose fragrant, container-friendly varieties |
| Bamboo canes (1.8–2m tall) or trellis | Support for climbing stems |
| Garden twine | Ties canes together and gives tendrils grip |
| Slow-release or liquid fertiliser | Feeds plants all season |
| Watering can | For consistent watering |
| Small pot or root trainer | For starting seeds |
| Sunny spot | Sweet peas need 6+ hours of sun |
Choosing the Right Container
Sweet peas have deep, questing root systems. They need a tall pot more than a wide one—depth really counts for good plants. Diameter is also important for stability.
Container size guide:
Material matters:
- Plastic pots are lighter and hold moisture longer.
- Terracotta looks beautiful but dries out faster. You can line the inside with a bin bag (poke drainage holes through) to slow water loss.
- Metal containers (galvanised buckets or troughs) can overheat in full sun, cooking the roots. Stand them where they get some shade at the base.
The golden rule: Drainage holes are non-negotiable. Sweet peas are thirsty, not amphibious—standing water will rot the roots within days.
The Best Soil Mix
The best planting mix for container-grown sweet peas is 50% multi-purpose compost, 40% topsoil, and 10% well-rotted manure. This gives you moisture retention from the compost, weight and minerals from the topsoil, and slow-release fertility from the manure.
If you do not have topsoil, straight multi-purpose compost will do the job—you will just need to feed more often, and you will probably get fewer flowers. Avoid garden centre “patio planter” mixes—they tend to be too light and free-draining for sweet peas and dry out in hours on a hot day.
Starting from Seeds
You have two options: start from seeds or buy established plugs. Growing from seed is more affordable but takes longer and requires more effort.
When to sow:
- Autumn sowing (October–November): Gives you stronger plants and earlier flowers.
- Spring sowing (January–March): Spring-sown plants will be about 3 weeks later than autumn-sown plants.
- In cold areas: Sow in late winter to early spring and keep in a cold greenhouse or on a bright windowsill.
Step-by-step:
- Fill a small pot or root trainer with quality seed compost.
- Wet the surface and push each seed in with your finger about 1cm deep.
- Top up with a little compost and water gently.
- Place the pots in a bright spot. Keep them at around 18–20°C (68–70°F) for germination.
- Do not water again until the green tips appear, usually after about 7 to 14 days.
- Once seedlings have three sets of leaves, pinch out the growing tip with scissors to encourage bushier growth.
My advice: I tried soaking my seeds before planting once, but it did not make any difference. The experts say there is no need to soak or chit seeds. Just plant them directly in moist compost and they will germinate fine.
Planting in the Final Pot
Step-by-step:
- Place the support first. Put your support structure (canes or trellis) into the pot before you plant. It is much harder to push canes into compost around established roots without damaging them.
- Fill the pot about three-quarters full with your soil mix.
- Plant your seedlings 10–15cm apart, close to but not touching the base of a cane. Bury them deeper than they sat in the plug—right up to the lowest side shoot.
- For a fuller display, plant one plug on either side of each cane.
- Water thoroughly after planting.
Building the Support
Sweet peas are climbers and need support early in their growth.
Option 1: Classic Wigwam
- Place five or six bamboo canes (1.8–2m tall) around the inside of the pot.
- Tie them together at the top.
- Wrap string or twine horizontally around the canes at 20cm intervals to give the tendrils extra grip as they climb.
Option 2: Cylinder
- Erect the canes vertically with their tops attached to a wire or plastic ring.
- Wind twine around the canes.
- This form contains the growth better than a wigwam.
Option 3: Trellis
Dwarf varieties need no support at all and will grow very successfully in low troughs.
Watering
Sweet peas in pots need more attention with watering than those in the ground.
The simple rules:
- Water every day it does not rain.
- Fully grown plants may need water even when it is raining, as the foliage deflects water away from the container.
- Keep the soil consistently moist but not saturated.
- Avoid wetting the leaves to prevent fungal disease.
Feeding
Plants growing in containers use up nutrients quickly and need regular feeding.
Feeding schedule:
My advice: I use a tomato feed once the first buds appear. The high potash encourages more flowers and keeps them coming all summer. Do not use feeds high in nitrogen once flowering starts—they can reduce flowering.
Ongoing Care
Pinch out growing tips. When plants are about 7.5–10cm high, pinch out the growing tips to encourage side shoots and fuller growth. This helps produce more flowering stems and a sturdier plant shape.
Tie in the stems regularly to their supports to keep them upright and prevent tangling.
Deadhead fading blooms to prolong flowering. If you let them go to seed, the plant will stop producing flowers.
Cut flowers for the house often—this also encourages more blooms.
Best Varieties for Containers
Quick Reference Table
| Task | What to Do | When |
|---|---|---|
| Sow seeds | Plant 1cm deep in seed compost | Autumn (Oct-Nov) or Spring (Jan-Mar) |
| Pinch out tips | Cut growing tip when 7.5–10cm tall | When seedlings have 3 sets of leaves |
| Plant in final pot | 10–15cm apart, bury deep | Late spring (after frost) |
| Water | Daily in dry weather | All season |
| Feed (early) | High nitrogen fertiliser | Weekly for first 4 weeks after planting |
| Feed (flowering) | High-potash fertiliser | Every 7–10 days once buds appear |
| Deadhead | Remove faded flowers | As they appear |
| Cut for vase | Cut stems regularly | Throughout flowering season |
My Personal Sweet Pea Routine
Here is what I actually do on my patio. You can copy this.
Late winter:
- I sow my seeds in small pots on my windowsill.
- I keep them in a bright spot and water sparingly.
Spring:
- When the seedlings have a few sets of leaves, I pinch out the tips.
- I prepare my large pot with the 50/40/10 soil mix.
- I build a wigwam of canes before planting.
- I plant my seedlings around the base of each cane and water well.
Summer:
- I water every day, sometimes twice if it is really hot.
- I feed with tomato fertiliser once a week once flowers appear.
- I tie in any stray stems and remove faded flowers.
- I cut bunches for the house—they smell incredible.
Since I started this routine, I have had beautiful, fragrant sweet peas every summer. It takes a little effort, but the reward is absolutely worth it.
The Bottom Line
Growing sweet peas in pots is not hard, but you do need to get the basics right. Use a deep pot, a good soil mix, and a sturdy support. Water daily and feed regularly—switch to a high-potash fertiliser once flowering starts. Choose compact or dwarf varieties for the best results in containers. Pinch out the growing tips early to encourage bushier growth, and deadhead faded blooms to keep the flowers coming.
I used to think sweet peas were too much trouble for pots. Now I know they just need the right care. Your patio can be filled with their beautiful colours and incredible fragrance all summer long. Try it—you will not regret it.
