Alphabetical Plant Listing

Lupinus rivularis (Riverbank Lupine)

Riverbank Lupine, Riverside Lupine, Streambank Lupine, Stream Lupine, Nine Finger, Lupinus lignipes, Lupinus amphibium


Noted for its showy floral display and pleasant fragrance, Lupinus rivularis (Riverbank Lupine) is a showy annual, biennial, or short-lived perennial boasting elongated clusters of purple-blue to white pea-like flowers from early spring to mid summer, depending on latitude and elevation. Lasting for about 2-4 weeks, the ravishing blossoms are borne atop tall, unbranched stems, well above the elegant foliage of palmately compound leaves. The flowers provide pollen and nectar for bumblebees and other native pollinators and beneficial insects. They are followed by sparsely hairy seed pods, which contain 6-10 seeds. Several species of birds use the seed for food. Birds, rabbits, and other small game use the abundant stems for cover. Riverbank Lupine grows from a deep taproot which penetrates the soil to a great depth (up to 5 ft.). It typically occurs in well-drained, sandy soils in British Columbia, west of the Cascades in Oregon and Washington, and in northwestern California below 500 m (1600 ft). Fast-growing, Riverbank Lupine is an excellent pioneer species for disturbed areas, helping with erosion control. It can also facilitate the establishment of grasses and other wildflowers in restoration seedings as a result of its ability to add nitrogen to the soil. It thrives on soils where other plants struggle, such as on sand dunes or roadside slopes.

  • Grows up to 1-5 ft. tall (30-150 cm).
  • Thrives in full sun in sandy or gravelly, well-drained soils. Best on soils low in nitrogen, such as sand dunes, cut slopes along roadsides, or dredge spoils, where competition is reduced.
  • Propagated by seed. Seed should be scarified or soaked in hot water (180°F) to overcome physical dormancy and enhance germination rates.
  • Native to California, Oregon, Washington and British Columbia.

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Requirements

Hardiness 7 – 9
Climate Zones 4, 5, 15, 16, 17, 24
Plant Type Annuals, Perennials
Plant Family Lupinus - Lupines
Exposure Full Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early,Mid)
Height 1' – 5' (30cm – 150cm)
Water Needs Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants United States, California, Pacific Northwest, Oregon, Washington
Attracts Birds, Butterflies
Garden Uses Banks and Slopes
Garden Styles Informal and Cottage, Prairie and Meadow

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By Danita Delimont, Shutterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 7 – 9
Climate Zones 4, 5, 15, 16, 17, 24
Plant Type Annuals, Perennials
Plant Family Lupinus - Lupines
Exposure Full Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early,Mid)
Height 1' – 5' (30cm – 150cm)
Water Needs Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants United States, California, Pacific Northwest, Oregon, Washington
Attracts Birds, Butterflies
Garden Uses Banks and Slopes
Garden Styles Informal and Cottage, Prairie and Meadow

Great Plant Combination Ideas with Lupinus - Lupines

Guides with Lupinus - Lupines

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