Perennial Pea

Lathyrus latifolius is native to southern Europe, including the Mediterranean region, the Iberian Peninsula, southern France, Italy, and the Balkans, where it grows in dry, rocky habitats, woodland edges, and scrubby hillsides.

• Cultivated in European gardens since at least the 16th century as an ornamental climber
• Introduced to Britain by the late 1500s, where it became a popular cottage garden plant
• Naturalized widely across temperate regions of the world, including North America, southern South America, and Australasia
• The genus name Lathyrus comes from the Greek "lathyros," an ancient name for a type of pea or vetchling
• The species epithet latifolius means "broad-leaved," referring to the wider leaflets compared to other Lathyrus species
• Unlike the annual sweet pea (Lathyrus odoratus), which was developed primarily in Sicily and Britain for its intense fragrance, the perennial pea was always grown for its rugged constitution and reliable flowers
• Seeds have been found in archaeological deposits in Europe, suggesting use as animal fodder since prehistoric times

Perennial Pea is a herbaceous to semi-woody climbing perennial that scrambles over supports to heights of 1.8–3 m using modified leaves called tendrils.

Stems: Winged, angular, hairless to slightly pubescent, pale green to bluish-green, reaching 1.8–3 m in length. The stem wings (flattened extensions along the angles) are a distinctive feature.

Leaves: Pinnately compound with a single pair of broadly ovate to elliptic leaflets, 4–10 cm long and 2–5 cm wide, gray-green to medium green. Each leaf terminates in a branched tendil used for climbing. Stipules are large and arrowhead-shaped, 2–5 cm long.

Flowers: Produced in axillary racemes of 3–10 flowers on long, stiff peduncles. Individual flowers are papilionaceous (pea-like), 2–2.5 cm long, in shades of pink, rose, magenta, or white, sometimes bicolored. The standard petal is broad and slightly notched at the tip. Flowers are showy but unscented or very faintly scented.

Fruit: Flattened, hairless legume pods 5–8 cm long, turning from green to tan-brown as they mature, containing 5–10 smooth, dark brown, rounded seeds. Pods split explosively when dry, flinging seeds several meters.

Roots: Forms a deep, fleshy, rhizomatous root system that allows the plant to persist for decades and makes it difficult to eradicate once established.

Perennial Pea grows naturally in dry, rocky habitats, scrubland, woodland margins, and roadside banks across southern Europe, where it tolerates poor soils, drought, and exposure.

• Thrives in full sun to light shade — flowering diminishes in heavy shade
• Tolerates a wide range of soil types including chalk, clay, sand, and loam, provided drainage is good
• Drought-tolerant once established due to its deep root system
• Naturalized extensively in North America, particularly in the northeastern US and Pacific Northwest, where it grows along roadsides, railways, and waste ground
• In the UK it has become a familiar wildflower of hedgerows and railway embankments
• Flowers are visited by bumblebees, honeybees, and various solitary bees
• The plant forms dense tangled thickets that provide shelter for small birds and mammals
• Not considered a serious invasive threat in most regions, though it can spread persistently by seed and rhizome
• Largely unpalatable to deer and rabbits due to toxic compounds

Perennial Pea is one of the easiest climbing plants to grow — plant it and it largely takes care of itself.

Site Selection: Full sun for best flowering. Plant against fences, trellises, obelisks, or allow it to scramble over banks and slopes as ground cover.

Soil: Any well-drained soil, including poor, dry, or chalky soils. Tolerates pH from slightly acidic to alkaline (pH 6.0–8.0). Avoid waterlogged conditions.

Planting: Sow seeds directly in fall or early spring, or plant container-grown specimens in spring. Scarify seeds or soak in warm water for 12 hours before sowing to improve germination. Space plants 30–45 cm apart.

Support: Provide a trellis, fence, netting, or pea sticks for the tendrils to climb. Will also scramble through shrubs.

Watering: Water during establishment. Once established, supplemental watering is rarely needed — this plant thrives on neglect.

Maintenance: Cut stems back to ground level in late autumn or early spring. No staking, feeding, or special care required.

Propagation: By seed (self-seeds freely), division of established clumps in early spring, or softwood cuttings in summer.

Hardiness: USDA Zones 3–9. Fully hardy across most temperate climates.

Note: All parts contain toxic amino acids — do not ingest seeds in quantity.