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Lathyrus tuberosus
tuberous pea
Lathyrus tuberosus
Lathyrus tuberosus, also known as the earthnut pea, is a perennial plant with attractive pink to red flowers. It produces edible tubers that were historically consumed. It's a vining plant that can spread, so it's best managed to prevent it from becoming overly aggressive. Its tubers are nitrogen fixing and have a nutty flavour. The seeds are also edible when cooked.
CategoryDetails
Plant TypePerennial plant
Culinary UsageEdible plant
Duration to maturity1 year to harvest
Estimated Plant Lifespan10 years lifespan
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: bees

Notes: Lathyrus tuberosus is primarily pollinated by bees, which are attracted to its nectar-rich flowers. Manual pollination can also be performed to ensure higher seed production.

Watering Requirements

Method: top water

Frequency: Water thoroughly when the top inch of soil feels dry.

Notes: Lathyrus tuberosus prefers well-drained soil and doesn't tolerate waterlogging. Reduce watering during dormant periods.

Humidity Requirements

Level: moderate

Care InstructionsProvide support for the vines to climb, such as a trellis or fence. Deadhead spent flowers to encourage continued blooming and tuber development. Mulch around the base of the plant to retain moisture and suppress weeds. Monitor for signs of pests and diseases.
Temperature Range

Min: -15°C

Max: 30°C

Alternative NamesFyfield pea, Dutch-mice, earth chestnut, earthnut
Allium schoenoprasum
Chives
Allium schoenoprasum
Chives deter aphids, which can sometimes affect Lathyrus tuberosus.
Echinacea purpurea
purple coneflower
Echinacea purpurea
Echinacea attracts beneficial insects that can help to keep Lathyrus tuberosus pest-free and both enjoy similar growing conditions.
Phleum pratense
Timothy grass
Phleum pratense

Timothy-grass is also a heavy feeder and can quickly outcompete Lathyrus tuberosus for nutrients and space.

Poa pratensis
Smooth Meadow-grass
Poa pratensis

Kentucky Bluegrass can form a dense mat that competes with Lathyrus tuberosus for nutrients and sunlight, hindering its growth.

Aphids

Aphids are small, sap-sucking insects that can infest Lathyrus tuberosus. They cause yellowing, distortion, and stunted growth. Look for clusters of small insects on new growth.

Spider Mites

Spider mites are tiny pests that suck sap from the leaves, causing stippling and webbing. They thrive in hot, dry conditions.

Steps:

    • Dig up mature plants in late autumn or early spring before new growth appears.
    • Carefully separate the tubers from the plant, ensuring each division has at least one growth point (eye).
    • Replant the tubers in well-draining soil at a depth of about 5-7 cm (2-3 inches), spacing them 15-30 cm (6-12 inches) apart.
    • Water thoroughly after planting.

Neem Oil

Effective against aphids and spider mites on Lathyrus tuberosus.

Diatomaceous Earth

Can be used as a soil amendment to help deter pests by creating a physical barrier and by promoting drainage.

Kelp Meal

Provides essential trace minerals for healthy growth and tuber development.