Earthnut pea
Lathyrus tuberosus · Fabaceae
The gardener's calendar
Ideal time to plant earthnut pea: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- June to August, pink to purple flowers
- Adult size
- 0.30 to 0.60 m in height
- Growth
- Fast
- Hardiness
- Hardy, down to -15 °C
- Origin
- Central and southern Europe
- Soil type
- Well-drained, fertile, deep
Care
Watering
Water regularly during the growing season, especially during dry periods, to keep the soil moist but not waterlogged. Once established, the plant tolerates drought well thanks to its underground tubers that store water. In winter, drastically reduce watering.
Exposure
Plant the tuberous pea in full sun or partial shade to optimize flowering. A south or west-facing exposure promotes better flower production and harmonious tuber development.
Soil and preparation
Prepare rich, loose, and well-drained soil enriched with compost or organic matter. The plant appreciates slightly chalky soils. Avoid winter waterlogging that could rot the tubers.
Fertilizer and nutrition
Apply balanced fertilizer in spring when growth resumes. Like legumes, the tuberous pea fixes atmospheric nitrogen and requires only moderate amounts. Excessive nitrogen would promote foliage at the expense of flowering.
Pruning and training
Pinch young stems in spring to encourage a bushier habit and better branching. At the end of the season, cut back dry vegetation. You can stake lightly if the plant grows in shaded ground.
Diseases and pests
Generally robust, the tuberous pea can be affected by powdery mildew in warm, humid weather. Ensure good air circulation and avoid foliar watering. Occasionally inspect for aphids, which can be treated with soapy water.
Did you know?
The tuberous pea was long consumed in Europe, particularly in the Middle Ages, for its small flavorful underground tubers when cooked. These tubers, rich in starch, constitute the plant's energy reserve and were once harvested as a food supplement or livestock fodder.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
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Tips generated and checked by Viridia — adapt them to your local climate.