Beach-pea
Lathyrus japonicus
Last reviewed: August 2026
Lathyrus japonicus, or beach pea, is a low sprawling vine that blooms purple-pink flowers from June through August. It thrives in full sun with low water, often along sandy shorelines and dunes.
Toxicity unknown
Beach-pea (Lathyrus japonicus) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
The USDA PLANTS Database (opens in new tab) does not flag Beach-pea as toxic to livestock.
Light
full sun
Water
low
Size
12"–48" H × 12"–48" W
Bloom
Jun, Jul, Aug
Native to
CA, CT, IL, IN and 14 more states
Pollinators
bees, butterflies
Before you buy
Your city may pay you to plant this
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Beach-pea is a trailing native vine with distinctive purple pea-like flowers that bloom throughout summer. This salt-tolerant plant naturally spreads along the ground, making it useful for erosion control on slopes or as groundcover in challenging sites.
Growing Beach-pea
Grow Beach-pea in full sun and low water. Mature plants reach 12 to 48 inches tall and spread 12 to 48 inches wide. Expect moderate maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Beach-pea takes more care to keep looking intentional in a front yard. Maintenance level: moderate. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Sprawling vine growth looks too wild for formal landscapes
- Can appear messy without regular management
- May spread beyond intended boundaries
Wildlife value
The flowers attract bees and butterflies during the long summer blooming period. As a member of the pea family, it also fixes nitrogen in the soil.
Common questions
- When does beach pea bloom?
- Beach pea typically flowers from June through August, producing clusters of pea-like purple to pink blossoms along its trailing stems.
- What growing conditions does beach pea need?
- Beach pea does best in full sun with sandy, well-drained soil and low water once established, similar to the coastal and dune conditions it is often found in.
- What pollinators visit beach pea flowers?
- Bees and butterflies are the main visitors to beach pea flowers, drawn to the nectar produced during its summer bloom period.
- Is beach pea a vine or a shrub?
- Beach pea grows as a trailing or climbing vine rather than an upright shrub, often sprawling along the ground or over dune grasses and other low vegetation.
- Is Beach-pea toxic to livestock?
- The USDA PLANTS Database does not flag Beach-pea as toxic to livestock.
- Is Beach-pea HOA-friendly?
- Beach-pea takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.
Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Beach-pea? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
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