Why heritage peas earn their keep in a tight space

If you garden on a modest plot, every plant has to justify its square metre. Heritage peas do that better than almost anything else you can sow in spring. They offer flavour that modern varieties rarely match, flowers that lift the whole vegetable bed, and a harvest you can pick over several weeks rather than all at once. Because they are open-pollinated, you can save your own seed and grow the same strain for years, adapting it quietly to your soil and your climate.

They are also kind to the ground. Peas are legumes, fixing nitrogen on their roots, and the haulm you dig in at the end of the season feeds whatever follows. Where a small plot has to work hard, that is a genuine bargain: a crop that gives you sweet pods in June and better soil by autumn.

Climbing heritage varieties for vertical crops

Tall peas are the obvious answer when the ground is limited and the sky is not. Trained up a wigwam, a netting panel or a row of hazel pea sticks, a climbing variety will crop far more heavily per square metre than a stubby one, and the flowers run from cream and white through pink to deep purple and bicolour.

• Alderman — a Victorian climbing pea reaching around 1.8m, with long pods and a generous yield. Excellent picked young for the table, and good left to dry for winter soups.
• Telephone — late Victorian and famously sweet, similar in height, and noticeably tolerant of a cool, damp spell in early summer.
• Ne Plus Ultra — dating from the 1840s, very tall, with wrinkled sweet seeds and splendid white flowers. It needs a sturdy frame and a long season to give its best.
• Golden Sweet — a yellow-podded mangetout with purple flowers. Pick the pods flat and young, before the peas inside begin to show.
• Ezetha's Krombek Blauwschok — violet flowers and deep purple pods that turn green on cooking. A talking point on any plot.

Give these at least 2m of support and a sheltered spot. A wigwam of four or five canes, with twine wound round, takes up little more ground than a single large shrub.

Dwarf heritage peas for the front of the bed

Dwarf peas need no support at all, which makes them ideal for the edge of a raised bed, a large pot, or the strip in front of taller crops. They crop over a shorter window, so sow them in succession if you want a steady supply.

• Tom Thumb — grown in Britain since before 1860 and barely 30cm tall, with small pods on compact plants. Charming, productive and perfect for containers.
• Kelvedon Wonder — a reliable 1920s dwarf, quick to mature and happy in most soils, with a good resistance to pea wilt.
• Douce Provence — a French heritage pea that can be autumn-sown under cloche for a very early crop, or sown in spring for a steady pick.
• Bijou — a dwarf mangetout around 60cm, with large flat pods and a long picking season if you keep at it.
• Half Pint — genuinely compact, useful where space is measured in centimetres rather than metres.

Sowing and spacing in a compact bed

Peas dislike root disturbance, so sow them where they are to grow. From March to early July in most of Britain, sow in a shallow trench about 5cm deep, spacing dwarf types 5–8cm apart and climbers 20–25cm apart. A double row with 20cm between the rows, and the support running down the middle, makes the best use of a narrow bed.

Work in plenty of garden compost beforehand, but avoid fresh manure and high-nitrogen feeds, which produce leafy plants and few pods. If mice or slugs are a nuisance, chit the seed first on damp kitchen paper in a cool room and plant out the sprouted peas carefully. Successional sowings every two to three weeks will keep pods coming from early June into September.

Keeping the crop happy: supports, water and pests

Pigeons will strip young shoots overnight, so net or fleece the rows until the plants are established. Pea moth is the other great thief: the grubs sit inside the pods, usually from midsummer. Sowing early and again in late June helps you dodge the worst of the flight, and a fine mesh cover over a later sowing keeps the moths out entirely.

Water thoroughly once flowering begins and keep watering through podding; a dry fortnight at that stage will cut your crop in half. A mulch of grass clippings or comfrey leaves holds moisture and keeps the roots cool. Powdery mildew on late crops is usually a sign of dry soil, so water at the base rather than over the leaves.

Harvesting, podding and saving your own seed

Pick mangetout while the pods are flat and translucent, sugar snaps just as the peas begin to swell, and garden peas while the pods are bright and firm. Go round every two or three days — plants that are left to set seed stop producing. Pods are sweetest within an hour or two of picking, so have the pan ready before you go out.

For seed, choose the earliest and healthiest plants and let a few pods dry to a papery brown on the stem. Shell them, spread the peas on a tray in a dry room for a fortnight, then store them in labelled paper envelopes with the year written on. Viability holds for four or five years. Finally, cut the stems at ground level and leave the nitrogen-rich roots in the soil, then dig in the haulm. Your small plot will thank you next spring.