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Lathyrus littoralis
silky beach pea
Lathyrus littoralis
Lathyrus littoralis, commonly known as Beach Pea or Silvery Beach Pea, is a perennial legume native to the west coast of North America. It thrives in sandy dunes and coastal areas, boasting silvery-grey foliage and showy purple or pink flowers. This plant has a deep root system, which helps stabilize sand dunes, and its seeds are an important food source for some wildlife. The plant has nitrogen-fixing abilities, enriching the soil. While tolerant of harsh coastal conditions, it's sensitive to overwatering and prefers well-drained soil.
CategoryDetails
Plant TypePerennial plant
Estimated Plant Lifespan5 years lifespan
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: animal

Notes: Pollinated primarily by bees.

Watering Requirements

Method: Top watering

Frequency: Water regularly until established, then water deeply but infrequently, allowing the soil to dry out between waterings.

Notes: Avoid overwatering, as it can lead to root rot.

Humidity Requirements

Level: moderate

Care InstructionsPrune spent flowers to encourage more blooms. Mulch around the base of the plant to help retain moisture and suppress weeds. Avoid disturbing the roots, as this can damage the plant.
Temperature Range

Min: -10°C

Max: 30°C

Leymus mollis
American dune grass
Leymus mollis
Both species thrive in sandy soils and tolerate salt spray, creating a natural dune ecosystem. The grasses provide some shelter from harsh winds.
Eriogonum latifolium
Seaside Buckwheat
Eriogonum latifolium
Similar habitat preferences and attracts beneficial insects that can help control pests.
Calamagrostis arenaria
European marram grass
Calamagrostis arenaria

While not traditionally invasive in its native area, it is very aggressive and outcompetes native dune plants like Lathyrus littoralis for resources, and it can alter the dune structure, making it less hospitable for beach pea.

Aphids

Aphids are small, sap-sucking insects that can infest Lathyrus littoralis, causing distorted growth and reduced vigor. They excrete honeydew, which can attract ants and lead to sooty mold growth.

Spider mites

Spider mites can cause stippling on leaves and webbing, leading to weakened plants and reduced flowering.

Steps:

    • Scarify seeds by nicking or rubbing with sandpaper.
    • Soak seeds in warm water for 24 hours.
    • Sow seeds in well-draining sandy soil.
    • Keep soil consistently moist until germination, which typically takes 1-3 weeks.

Neem oil

Natural insecticide for controlling aphids and spider mites.

Kelp meal

Provides essential micronutrients and improves soil health.