A fast, cold-tolerant cover crop that fixes nitrogen, smothers weeds, and pulls double duty as edible pea shoots and dry soup peas.
Pisum sativum subsp. arvense · also called Austrian winter pea, Forage pea
Windows are counted from the average date of your last spring frost.
Few cover crops give this much back this fast: a dense pea stand shades out weeds, and the nitrogen banked in its roots feeds next season's greens. Young shoots are a real harvest along the way.
A little history. A field-type form of the garden pea, selected for vine and seed rather than sweetness. Its roots host bacteria that pull nitrogen from air into nodules on the root hairs.
Sow seeds 1½ inches (38 mm) deep, and aim for 2 inches (5 cm) between plants once thinned. Sow 1–1.5 in deep and firm the soil over the seed. Keep the top inch moist until shoots break through. Seedlings emerge in 7–14 days.
Water weekly in dry spells until vines cover the ground. Water when the top inch of soil feels dry. Aim for about 1 inch per week including rain.
No nitrogen feeding — it makes its own. What to use: compost at sowing; coat seed with pea and vetch inoculant on new ground.
Cut the top 4–6 in of vine tips for eating; the plant branches out below the cut and keeps covering ground.
It's ready when for soil building, cut when the first flowers open and before pods fill — that is peak nitrogen. For shoots, snip tips at 6–8 in. For dry peas, wait until pods rattle. Snip shoot tips with scissors above a leaf joint. To terminate the stand, mow or shear at the soil line and leave the roots in place, or turn the whole top growth under with a fork.
Pea shoots keep 5 days in a bag in the fridge. Dry peas store a year in a sealed jar in a cool, dark cupboard once fully hard.
Sow a fresh patch every 3 weeks in spring for a steady run of shoots; stop once daytime highs settle above 80 °F (27 °C).
Winter types sown in early fall hold green through cold, then surge in spring. Cut them down at first bloom, before they set seed and go woody.
Oats
Oat stems give pea tendrils something to climb, lifting the vines off damp ground and letting air move through the stand. The pea's root nodules bank nitrogen that mostly releases next season as the residue breaks down. Sow both in one pass at about half rate each.
Barley
Barley grows fast and stiff early, so the pea has a ladder before it starts to sprawl. The mix cuts weed cover further than either alone, and the pea contributes nitrogen the following season as its roots decay.
Rye
Rye is the toughest overwintering partner for winter field pea: it stays standing through cold and holds the vines up when spring growth takes off. Cut both together at pea bloom, before rye stems turn tough and slow to break down.
Wheat
Wheat's upright stems keep pea vines off the soil where rot starts, and the pea threads through without shading the grain much. Nitrogen fixed in the pea roots is largely a gift to whatever follows, not to the wheat growing beside it.
Emmer
Emmer is tall with fairly slim stems, so use a lighter pea rate — roughly one part pea to two parts grain — or the vines pull the stand over. Grown at that balance, the pea climbs cleanly and leaves nitrogen behind for the next crop.
Einkorn
Einkorn is fine-stemmed and can bend under a heavy pea load, so sow the pea sparingly. At a light rate the pairing often works well: the grain gives support, the pea covers open ground and builds nitrogen for the following season.
Spelt
Spelt stands tall and holds firm, which suits a vigorous pea vine. Sown together in fall, the two make a thick winter cover; cut them at pea bloom so the mix is soft enough to break down before spring planting.
Buckwheat
Buckwheat's open flowers feed hoverflies and tiny parasitic wasps, whose larvae hunt pea aphids. Sow a strip alongside a summer pea patch rather than mixed in, since buckwheat outgrows young pea seedlings.
Phacelia
Phacelia draws in hoverflies and lacewings that work over aphid colonies on nearby pea tips, and it flowers early enough to be useful during the spring pea window.
Fennel
Fennel roots release compounds that reliably stunt most garden vegetables, and pea seedlings are no exception. Plant fennel well away in its own corner, where its flowers can still feed hoverflies and tiny parasitic wasps.
Old charts keep peas and the onion family apart, and gardeners have long repeated the advice. No mechanism has been demonstrated, so treat it as a preference rather than a rule — separate the two if you like tradition, and watch your own bed.
Give the pea and bean family 2 years away from this spot before any of its relatives return.
The cabbage family, the beet family or grasses and grains thrive in this ground next season.
Field pea is a giver: its root nodules bank nitrogen that mostly releases the following season as roots break down. Keep pea and bean family crops out of this bed for 2 years. Follow with cabbage-family crops, with beets, chard or spinach, or with a cereal grain.
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