General: This is one species of 4 Lathyrus species known in BC. It is a perennial vine that can climb using tendrils.
Height: The vine can grow up to 7 feet long.
Flowers: Flowers grow in clusters of 5 – 15 blooms and can be red, white, or pink. Flowers are typical of the pea family with distinct wing-like shape & single seed pod protruding from the center. The seeds look like edible pea pods.
Leaves/Stems: The leaves are 3 inches long and 1 inch in width and are smooth.
Root: Rhizomatous, deep with a broad horizontal scope.
Narrow-leaved Everlasting Pea
Marsh Peavine (Lathyrus palustris), native. This peavine grows in moister habitats like mudflats, lakesides, and marshes. Flowers are pink to bluish-purple. Leaves are broad and dark green.
Broad Leaved Peavine (Lathyrus latifolius), invasive. Broad-leaved peavine has larger seedpods & larger leaves.
Where did it come from? Native to Europe. It was introduced as a garden ornamental.
Where does it grow here? Flat Peavine prefers dry soil and can tolerate partial to full sun. It thrives on disturbed sites and becomes dense especially along roadsides.
Reproduction: By seed & rhizome.
When does it grow, flower & seed? It flowers between June and October.
Spreads By: It spreads primarily by roots. It can die back each winter and grow from the roots. Seed pods twist off and eject the seeds up to 10 meters away. It is still sold in “naturalized” garden seed mixes & can be introduced by boots, tools, vehicles, and mowing.
Plant Type: Perennial vine.
Jefferson County Noxious Weed Control Program. Best Management Practices: Everlasting Peavine, Flat Pea. www.co.jefferson.wa.us/WeedBoard. 360-379-5610 ext 205.
Sea to Sky Invasive Species Council website.