Peas are one of the easiest wins in a temperate-zone spring garden. Growers in places like Nelson, Marlborough, Hawke's Bay, and the Waikato can sow from September right through to February, with the earliest sowings clearing before the worst of summer heat and later sowings carrying on into an autumn harvest. It's a genuinely forgiving crop — sweeter and more tender than most summer vegetables, and it improves your soil for whatever follows it.
The catch is timing the sowing to avoid the two things that actually kill pea crops here: cold, wet soil early in spring, and heat stress if you sow too late.
Understanding NZ Temperate Springs for Peas
The temperate zone doesn't have the hard, prolonged freezes of Canterbury or Central Otago, but spring here still brings:
- Occasional frost into early spring — the zone's frost-risk window runs April–November, so a September sowing can still see a light frost while seedlings are small
- Cool, wet soil in early spring that slows germination and can cause seed or root rot
- Rising heat from December onward that stresses flowering and pod-set on later sowings
Peas handle cold reasonably well once established — light frost doesn't bother them. What they're genuinely sensitive to is waterlogged soil early on, and heat stress if sown too late in the window.
When to Sow
| Sowing Window | Harvest Timing | Notes |
|---|---|---|
| September | December | Best timing — soil is warming, plenty of cool growing weeks before summer heat arrives |
| October | January | Still comfortably ahead of peak summer heat |
| November–December | February–March | Watch for heat stress around flowering; mulch and water consistently |
| January–February | April–May | Late succession sowing for an autumn crop; give afternoon shade in hot spells to protect flowering |
September sowing gives the most reliable results in most temperate regions. Soil is warming (peas need it above 10°C to germinate well), and plants get a full run of cool growing weeks before summer heat sets in. Sowing this early is also the easiest way to avoid the starchy, tough pods that come from a crop that matures in hot weather.
If you missed spring, a January–February sowing for an autumn harvest works too — just expect slower pod development in late-summer heat, and give the row some afternoon shade if you're getting a run of hot days during flowering.
Varieties That Actually Work
Shelling Peas (for fresh or frozen)
'Greenfeast' — the standard-setter for NZ home gardens. Reliable germination, good yield over a long harvest window, widely available from Kings Seeds. Direct sow.
'Giant Alderman' / 'William F Massey' (Koanga Institute) — tall heritage climbing types with excellent flavour. Need a substantial trellis (1.5–2m) but reward the effort with a long, heavy harvest. Better suited to an early (September) sowing so they have time to build their climbing structure before flowering.
'Mucio' (Kings Seeds) — a reliable direct-sow shelling variety, good for succession sowing through the window.
Snow Peas and Sugar Snaps (eat pod and all)
'Snow Sugar Pod' / 'Snow Goliath' / 'Snow Shiraz' (Kings Seeds) — direct-sow snow pea options with flat, sweet pods. Reliable across the full September–February window.
'Sugar Snap Tall' (Kings Seeds) — thick, sweet, round pods, direct sow. Needs staking (grows tall) but is highly productive.
'Southland Sno' / 'Picton Sno' (Koanga Institute) — tray-raised snow pea varieties; sow into trays and transplant at 5cm high onto a trellis. A good option if slugs, snails, or birds are a problem for direct-sown seed in your garden.
Soil and Drainage — More Important Than the Seed Catalogue
Peas die in waterlogged soil, and spring in the temperate zone brings exactly that risk while the ground is still cool and wet.
- Raise beds by even 15–20cm if drainage is suspect
- Add coarse grit to heavy clay soils
- Never sow into waterlogged ground — wait for it to drain, even if it means a slightly later sowing
- Avoid areas that sit wet after rain
Peas don't need rich soil. They fix their own nitrogen, and too much soil nitrogen produces lush leafy plants with poor pod set. If your soil is reasonable, don't add fertiliser before sowing. Side-dress with compost after flowering if plants look pale.
Sowing and Support
Sow direct — peas don't transplant well from open ground due to their root systems (the Koanga tray-raised varieties above are the exception, raised specifically to dodge slug and bird damage on young seedlings). Sow 3–4cm deep, 8–10cm apart, in double rows with a 60cm path between double rows.
Inoculant is worth it if growing peas on ground that hasn't had legumes before. Pea/bean inoculant (a rhizobium powder) is available from Kings Seeds — it dramatically improves nitrogen fixation and establishment. Cheap insurance.
Support immediately. Even dwarf varieties benefit from support once spring winds pick up. Drive in stakes at both ends of the row and run horizontal strings every 20cm as the plants grow. Taller and climbing varieties need pea netting or a framework of twiggy branches.
What Goes Wrong
Root rot from waterlogging. The most common cause of failure with an early spring sowing. Plants suddenly collapse and pull up with brown, rotted roots. Prevention only — improve drainage before the next sowing. No cure once it's set in.
Poor pod set from heat stress. If you sow later in the window (November onward) and get a run of hot days during flowering, pods set poorly or the plant bolts to finish early. Mulch to keep roots cool, water consistently, and consider afternoon shade for a January–February sowing.
Powdery mildew. Common as the season warms, particularly on plants still cropping into summer. You can slow it with good air circulation, but once mildew arrives on an aging plant, the season is nearly over anyway. Pull and compost when mildew is widespread and yield is dropping.
Mice. Pea seeds are a favourite target. If germination is patchy, dig up a non-germinated seed — if it's missing, mice are the culprit. Solutions: use one of the tray-raised varieties above, or lay fine wire netting flat over the row for the first 2–3 weeks.
Poor germination in cold, wet soil. If you're sowing in early September and germination is slow, soil temperature is the issue. A cloche over the row for 2 weeks before sowing will raise soil temperature enough to help — or simply wait another week or two for the soil to warm.
Spring peas are just the start. See everything to sow in the NZ temperate zone this season →