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Ourdoor
February 8, 2026

How to Grow Sweet Peas in South Africa (Old Spice Mix + Planting Calendar)

Sweet peas: the most rewarding fragrant cut flower for South African gardens

Sweet peas (Lathyrus odoratus) are famous for their ruffled blooms and old-school perfume. They’re also one of the best “cut-and-come-again” flowers — the more you pick, the more they flower. The trick in South Africa is simple: sow for cool-season growth, give them rich soil, and support them early.

👉 Shop seeds: Sweetpea – Old Spice Mix

When to plant sweet peas in South Africa

Sweet peas prefer cool weather. In most areas, sowing from late summer into autumn gives the strongest plants for winter growth and spring flowering.

Region	Best sowing window	Quick notes
Western Cape	Mar – May	Great cool-season performer. Watch fungal issues in very wet spells.
Highveld / Gauteng	Late Feb – Apr	Cool nights help. Keep watering consistent in dry winter air.
KZN (humid)	Apr – Jun	Prioritise airflow. Water at the base, avoid wet foliage.
Eastern Cape	Mar – May	Coastal vs inland varies. Shelter young plants from harsh cold snaps.
Northern Cape	Apr – May	Mulch well and water deeply — containers dry out fast.

How to plant sweet pea seeds (the reliable method)

1) Choose the right spot

Full sun gives the best flowering and stronger stems.
Pick a spot with good drainage and room for a trellis or netting.

2) Prepare rich soil (this is where the magic is)

Sweet peas love fertile soil. Mix in plenty of compost. If your soil is sandy, add extra organic matter so it holds moisture better.

3) Soak the seeds overnight

Soaking helps germination (sweet peas have a tougher seed coat). Optional, but highly recommended.

4) Sow depth and spacing

Sow 2–3 cm deep
Space 10–15 cm apart
Keep soil evenly moist until germination

5) Add support early

Install your trellis, netting, fence, or teepee while plants are small so you don’t disturb roots later.

6) Pinch for more stems

When seedlings reach about 10–15 cm, pinch out the growing tip. This encourages branching — which means more flowering stems.

Care & feeding (simple routine)

Water at the base once established, especially during dry spells. Avoid soaking leaves (important in humid regions).
Mulch to keep roots cool and moisture stable.
Feed lightly every 2–3 weeks during active growth (too much nitrogen = lots of leaves, fewer flowers).
Keep picking — letting pods form slows flowering.

How to harvest sweet peas for long stems (cut flower tips)

Harvest in the early morning when stems are firm.
Pick stems with 1–2 open flowers and a few buds for best vase life.
Cut long stems regularly — it drives more flowering.

Sweet peas in pots (yes, you can!)

Sweet peas grow well in large pots if the mix is rich and drains well. Just remember: pots dry out faster, so water and feeding must be more consistent.