Sweet Pea Knee High

🌱 Growing Sweet Peas from Seed in Australia

Sowing: In Trays vs. Direct in the Ground

Sweet peas (Lathyrus odoratus) are cool-season climbers that thrive with a bit of early planning. In most climates across Australia, sowing begins from late autumn through to early winter—May to July depending on your local frost dates.

Starting in Trays
Sowing in trays or small pots gives you a strong head start, especially if your winters are particularly wet or your soil stays cold and soggy. Sweet peas develop long roots early on, so deep trays or root trainers are ideal. Simply:

• Soak seeds overnight to help soften their hard outer coat (this helps with germination, especially in cooler regions).
• Sow 2–3 cm deep in a high-quality seed-raising mix.
• Keep in a sunny, sheltered spot and protect from snails and slugs.
• Transplant when seedlings are 10–15 cm tall and show a few sets of leaves.

This method is ideal for regions with heavy soil or where you want to get a jump on the season.

Direct Sowing
In areas with mild winters and free-draining soil, direct sowing works a treat. Once danger of severe frost has passed and the soil can be worked, sow seeds 5 cm apart and 2–3 cm deep into prepared beds. Choose a spot where they’ll receive full sun and won’t sit in boggy ground.

Direct-sown sweet peas often develop a more robust root system—but they do need protection from slugs, snails and hungry birds in the early stages.

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🌿 Seed Pre-Treatment

While not absolutely necessary, soaking sweet pea seeds overnight in warm water before sowing softens their hard coat and speeds up germination. You can also nick the seed coat gently with a nail file if you’re in a hurry—but don’t worry if you skip this; healthy seeds will germinate with a little patience.

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🌞 Soil & Position

Sweet peas are hungry, sun-loving plants. They’ll reward you best in:

• Full sun (at least 6 hours daily)
• Neutral to slightly alkaline soil (pH 6.5 to 7.5)
• Rich, well-draining soil, boosted with compost and aged manure

Before planting, dig in compost or worm castings, and a sprinkle of lime if your soil is on the acidic side. Mulch well to keep moisture in and weeds down.

Support is a must—they’re vigorous climbers! Provide trellises, teepees, wire fences or obelisks at planting time, so you don’t disturb the roots later.

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🌸 Care & Maintenance

Sweet peas are pretty low-fuss once established. Here’s how to keep them thriving:

• Watering: Keep soil consistently moist but not soggy. Deep watering twice a week in dry weather encourages strong roots.
• Feeding: A light liquid feed every 2–3 weeks (like seaweed or fish emulsion) helps flower production.
• Pinching: Once seedlings reach about 10–15 cm tall, pinch out the growing tip to encourage bushier plants and more blooms.
• Tying In: As they grow, gently tie stems to supports using soft twine or plant clips.
• Deadheading: Remove spent flowers regularly to encourage more blooms. Letting them set seed too early slows flowering.

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🌼 Companion Planting

Sweet peas are more than just pretty faces—they play well with others, too:

Companion	Benefit
Lettuce	Sweet peas can offer partial shade.
Carrots & Beets	Enjoy the nitrogen boost from pea roots.
Calendula	Attracts beneficial insects and pollinators.
Radish	Quick crop that doesn’t compete much.
Avoid: Onion & Garlic	They can inhibit sweet pea growth.

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✂️ Harvesting Sweet Peas

Harvest often and early! Picking regularly encourages more flowers and stops the plant from going to seed too soon.

• Begin cutting once the first flowers open, ideally in the cool of morning.
• Use clean, sharp snips and cut long stems to encourage further blooms.
• Sweet peas last longer in the vase if conditioned in cool water for a few hours.

For the best fragrance, go for the older heirloom or heritage varieties—they may have smaller flowers, but their scent is far superior to the newer, showy types.

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🐛 Common Issues & Fixes

Problem	Symptoms	Fix/Prevention
Slugs & Snails	Holes in leaves, missing seedlings	Use traps, pellets, or copper tape
Powdery Mildew	White powder on leaves	Improve air circulation, avoid overhead watering
Aphids	Sticky residue, distorted growth	Hose off or spray with soapy water
Poor Flowering	Lots of leaves, few blooms	Cut back on nitrogen, feed with potash
Stunted Growth	Yellowing, wilting	Check drainage, don’t overwater

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🌾 Seed Saving Guide

Saving sweet pea seeds is satisfying—and easy if you let a few pods mature. Here’s how:

1. Choose your best plants—healthy and fragrant with abundant blooms.
2. Leave some pods on the vine until they brown and rattle when shaken.
3. Pick pods on a dry day, shell them, and remove any soft or mouldy seeds.
4. Dry seeds completely—spread them out on paper in a cool, airy spot for 7–10 days.
5. Label & store in paper envelopes in a cool, dry place. They’ll remain viable for 2–4 years.

Keep in mind: Sweet peas can cross-pollinate, so if you’re saving seed for consistent traits, stick to one variety or grow different types well apart.

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🌟 Final Thoughts

Sweet peas are one of those flowers that seem to reward the gardener twice: once with their visual charm, and again with their unforgettable scent. In my own patch, I’ve learned the earlier I get them started, the stronger and more productive they are come spring. An afternoon sowing seeds in late autumn sets the scene for a garden full of colour, bees, and armfuls of blooms for the house.

Whether you’re growing for bouquets, pollinators, or pure joy, sweet peas are a beautiful reminder that with a bit of patience and care, the most charming things often come from the humblest of beginnings.

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