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Lupinus rivularis (Riverbank Lupine)

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

Lupinus rivularis, Riverbank Lupine, Riverside Lupine, Streambank Lupine, Stream Lupine, Nine Finger, Lupinus lignipes, Lupinus amphibium, Purple Flowers, Purple Perennial

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 containing 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 that 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 seedlings due to 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. The seed should be scarified or soaked in hot water (180°F) to overcome physical dormancy and enhance germination rates.
  • All parts, particularly the seeds, may cause severe discomfort if ingested. Toxic only if eaten in large quantities. Wear gloves and wash your hands after handling.
  • Toxic to dogs, toxic to cats, toxic to horses, toxic to humans.
  • Native to California, Oregon, Washington, and British Columbia.

Requirements

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

Lupinus nanus (Sky Lupine)
Lupinus arboreus (Tree Lupine)
Lupinus succulentus (Arroyo Lupine)
Lupinus bicolor (Miniature Lupine)
Lupinus latifolius (Broadleaf Lupine)
Lupinus texensis (Texas Bluebonnet)

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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.
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Requirements

Hardiness 7 - 9
Climate Zones 4, 5, 15, 16, 17, 24
Plant Type Annuals, Perennials
Plant Family Leguminosae
Genus Lupinus
Common names Lupine
Exposure Full Sun
Season of Interest Spring (Early, Mid, Late)
Summer (Early, Mid)
Height 1' - 5'
(30cm - 150cm)
Maintenance Low
Water Needs Average
Soil Type Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Fragrant, Showy
Native Plants California, United States, Oregon, Pacific Northwest, Washington
Attracts Bees, Birds, Butterflies
Garden Uses Banks And Slopes
Garden Styles Prairie and Meadow, Informal and Cottage
How Many Plants
Do I Need?
Explore Great Plant Combination Ideas
Lupinus (Lupine)
Guides with
Lupinus (Lupine)
Not sure which Lupinus (Lupine) to pick?
Compare Now

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