Snow Peas: Sowing, Supporting and Picking Them Flat

Snow peas are a cool-season crop picked before the pod fills. Sowing windows, how they differ from sugar snaps, trellising, and why yours turned tough.

By Zakaria September 18, 2026 5 min read Save to Pinterest

Four flat snow pea pods on a white background, the peas inside showing only as faint bumps — Photo: Renee Comet (Photographer) / National Cancer Institute, Public domain, via Wikimedia Commons

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Snow peas are picked before the peas arrive — the flat pod is the crop, and the window between perfect and stringy is about two days.

The short answer

Snow peas are a cool-season legume sown four to six weeks before the last frost, once soil is above about 40°F, and again in late summer for an autumn crop. They are picked when the pod has reached full length but is still flat and the peas inside are barely visible, roughly five to seven days after flowering; picked later the pod goes fibrous. Dwarf varieties reach 2 to 3 feet and tall ones 5 to 6, and all crop better with support. Being legumes they fix their own nitrogen, so rich feeding produces foliage instead of pods. Production stops once daytime temperatures settle above the mid-seventies.

Sow early — 4–6 weeks before last frost, soil above 40°F
Pick flat, before the peas swell. 5–7 days after the flower
Support everything, even the dwarfs
Do not feed nitrogen — they make their own
Heat ends the crop. Above the mid-70s they quit

Snow peas, sugar snaps, shelling peas

Three crops from one species

	Snow pea	Sugar snap	Shelling pea
Eat the pod?	Yes	Yes	No
Pod wall	Flat, thin, translucent	Rounded, thick, crisp	Tough, fibrous
Pick when	Pod full length, still flat	Pods plump and filled	Peas fully swollen
Also called	Mangetout	Sugar pea	Garden pea, English pea

They are not stages of each other. A snow pea left to fill does not become a sugar snap — it becomes an overgrown snow pea with a leathery wall and a string down the seam.

Timing

This is a cool-season crop with a short useful life. Get it wrong and the plants come good exactly as the weather turns against them.

When to sow

Sowing	Timing
Spring	4–6 weeks before last frost, soil above 40°F
Autumn	10–12 weeks before first autumn frost
Mild winters (zones 8–10)	Autumn sowing for a winter and early-spring crop

Seedlings take a light frost without harm; flowers and young pods do not. Germination is slow in cold soil — two to three weeks at 40°F against about a week at 60°F — but an early sowing still beats a later one, because the plant needs to be cropping before the heat arrives.

Above the mid-seventies, flowering falls off, pods toughen and the plants give up. That is the deadline everything works backward from.

Sowing and growing

Direct sow. Peas dislike root disturbance and rarely gain anything from transplanting
1 inch deep, 2 inches apart, rows 18 to 24 inches apart — or a double row either side of a net
Inoculant on ground that has not grown peas or beans before: a pea and bean inoculant supplies the rhizobia the root nodules need
Do not pre-soak for long. An hour is plenty; overnight soaking in cold soil invites rot
Thin lightly or not at all. Peas are happy crowded

Conditions


Sun	Full sun in spring; light afternoon shade helps late in the season
Soil	Moisture-retentive, well drained, near-neutral pH
Water	Steady, especially from flowering onward
Feed	Compost only. No nitrogen — they fix their own
Mulch	Yes. Keeps roots cool and extends the season

Nitrogen is the classic mistake

Peas carry nitrogen-fixing nodules on their roots. A general-purpose high-nitrogen fertiliser gives a tall lush vine that flowers late and sparsely.

If you feed at all, use something low in nitrogen. Better: compost, and nothing else.

Support

Every variety benefits, whatever the packet implies.

Matching support to variety

Variety type	Height	Support
Dwarf (Oregon Sugar Pod II, Dwarf Grey Sugar)	2–3 ft	Twiggy sticks, low net, short canes
Tall (Mammoth Melting Sugar, Golden Sweet)	5–6 ft	Netting, trellis, strings, bean poles

Put the support in before or at sowing. Peas climb with tendrils and grab whatever is nearest; pushing canes into a bed of established plants tears roots and flattens vines.

Sprawling plants sit on wet soil, rot at the base, pick badly and mildew — which is why even a two-foot variety earns its sticks.

Picking

The whole game is timing.

Pods are ready 5 to 7 days after the flower drops
Full length, still flat, peas visible only as faint bumps
Every one to two days once they start
Hold the vine with one hand and pull the pod with the other — one-handed picking tears stems
Pick everything, every time. A single pod allowed to mature seed tells the plant its job is done and flowering slows across the whole vine

A pod that has gone too far is not wasted — leave it to fill completely and shell it like a garden pea, or let it dry on the vine for next year’s seed.

Fresh is the point. The sugars begin turning to starch within hours of picking, which is exactly why home-grown snow peas taste like a different vegetable from supermarket ones.

Problems

Powdery mildew — white dust on leaves, near-inevitable late in the season. Airflow, water at the base, choose resistant varieties, and accept it as the end of the crop
Pea moth — maggots inside pods; worst on midsummer crops, avoided by early or late sowings
Birds — pigeons strip seedlings. Net the row early
Mice — dig up sown seed. Start in modules if it is a recurring problem
Damping off — cold wet soil rotting seed before it emerges. Warmer soil, not deeper sowing
Powdery-looking leaves plus stunted growth — often just heat. The season is over

Varieties

Oregon Sugar Pod II — 2–3 ft, heavy cropper, disease-resistant. The reliable default
Mammoth Melting Sugar — 5–6 ft, large pods, needs real support
Dwarf Grey Sugar — 2–3 ft, purple flowers, ornamental and edible
Golden Sweet — tall, yellow pods, easy to spot when picking
Avalanche — stringless, large flat pods, good disease resistance

Common questions

When should I plant snow peas?

As early in spring as the soil can be worked — four to six weeks before the last frost, once the soil is above about 40°F. They are a cool-season crop that stops producing when daytime temperatures settle above the mid-seventies, so a late sowing runs out of season before it crops. A second sowing in late summer, timed roughly ten to twelve weeks before your first autumn frost, gives an autumn picking in most regions.

What is the difference between snow peas and sugar snap peas?

Both are eaten pod and all, but they are picked at different stages and have different pods. Snow peas have flat, thin, translucent pods and are picked before the peas inside swell — the pod is the crop. Sugar snaps have rounded, crisp, thick-walled pods and are picked once the peas have filled out, so they are plump and sweet. A snow pea left on the vine does not become a sugar snap; it becomes a tough, stringy, overgrown snow pea.

How tall do snow peas grow and do they need support?

It depends entirely on the variety, and the packet will say. Dwarf types such as Oregon Sugar Pod II reach 2 to 3 feet and manage with twiggy sticks or a low net. Tall types such as Mammoth Melting Sugar reach 5 to 6 feet and need proper netting, a trellis or strings. Even the dwarfs crop better supported — sprawling plants sit on damp ground, pick badly and get mildew, so some support is always worth giving.

When do you pick snow peas?

When the pod has reached full length but is still flat, with the peas inside just visible as faint bumps rather than swellings. That is usually five to seven days after the flower drops, and the window is short — a day or two late gives a fibrous pod. Pick every one to two days once they start, holding the vine with one hand and pulling the pod with the other, because the plant stops flowering as soon as it is allowed to mature seed.

Why are my snow peas tough and stringy?

They were picked too late. Once the peas inside begin to fill, the pod wall thickens and the fibres along the seam toughen, and nothing in cooking reverses it. Heat does the same thing faster — plants cropping into warm weather produce tougher pods and eventually stop. Pick young, pick often, and start the crop early enough that it finishes before real summer heat arrives.

Do snow peas need fertiliser?

Very little. Peas are legumes and fix their own nitrogen through root nodules, so a nitrogen-rich feed gives a large leafy vine that flowers poorly. Ordinary soil with some compost worked in is enough, and phosphorus and potassium matter more than nitrogen. The one genuinely useful addition on a bed that has not grown peas or beans before is a pea and bean inoculant, which supplies the rhizobia bacteria the nodules depend on.

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