Alphabetical Plant Listing

Lupinus arboreus (Tree Lupine)

Yellow Bush Lupine, Bush Lupine, Tree Lupine, Coastal Bush Lupine


Very showy and sweetly fragrant, Lupinus arboreus (Tree Lupine) is a fast-growing evergreen shrub forming a large, round, bushy mound of silky, dark green, palmately compound leaves with 5-12 leaflets. In early spring to early summer, erect racemes, up to 12 in. long (30 cm), of usually yellow pea-shaped flowers can be admired. Lilac, blue, white or mixed flowering forms are also known. They are attractive to bees, butterflies and many pollinators. The blossoms are borne at the tips of short branches well above the handsome foliage. They give way to relatively large seeds with corresponding high seedling survival. Native to coastal areas of western North America, Tree Lupine prefers to grow on bluffs, dunes and slopes. Ideal for coastal situations, Tree Lupine can grow somewhat aggressively. Once a population becomes established, it spreads short distances by rodents or by seeds rolling from parent plants down dune slopes.

  • Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society.
  • Grows up to 5-8 ft. tall and wide (150-240 cm).
  • Thrives in full sun in sandy, well-drained soils. Tolerates partial shade, but best flower production occurs in full sun. Requires little to no water. Water maximum twice per month in summer after the plant is established.
  • An excellent choice for beds and borders, coastal gardens, cottage gardens, prairies and meadows.
  • No serious pest or disease issues. Keep an eye out for slugs, snails, aphids, powdery mildew. Deer resistant.
  • Propagate by seed or basal cuttings.
  • While Lupinus arboreus is native from the San Francisco Bay Area south, it is considered invasive further north. Around Humboldt Bay, it invades coastal dunes, replacing a diverse plant community with a dense monoculture of shrubs.
  • All parts, particularly the seeds, may cause severe discomfort if ingested.
  • Native to British Columbia, California, Oregon, Washington.

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Requirements

Hardiness 7 – 10
Heat Zones 9 – 10
Climate Zones 4, 5, 14, 15, 16, 17, 22, 23, 24
Plant Type Shrubs
Plant Family Lupinus - Lupines
Exposure Full Sun, Partial Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early)
Height 5' – 8' (150cm – 240cm)
Spread 5' – 8' (150cm – 240cm)
Spacing 60" – 96" (150cm – 240cm)
Water Needs Low, Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Well-Drained
Characteristics Cut Flowers, Fragrant, Showy, Evergreen
Native Plants United States, California, Pacific Northwest, Oregon, Washington
Tolerance Deer
Attracts Birds, Butterflies
Garden Uses Beds and Borders
Garden Styles Coastal Garden, Informal and Cottage, Prairie and Meadow

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Miguel Vaca, Gailhampshire, Tom Hilton, Flickr, Sundry Photography, Barnes Ian, Shutterstock, Botanik Foto

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 – 10
Heat Zones 9 – 10
Climate Zones 4, 5, 14, 15, 16, 17, 22, 23, 24
Plant Type Shrubs
Plant Family Lupinus - Lupines
Exposure Full Sun, Partial Sun
Season of Interest Spring (Early,Mid,Late)
Summer (Early)
Height 5' – 8' (150cm – 240cm)
Spread 5' – 8' (150cm – 240cm)
Spacing 60" – 96" (150cm – 240cm)
Water Needs Low, Average
Maintenance Low
Soil Type Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Well-Drained
Characteristics Cut Flowers, Fragrant, Showy, Evergreen
Native Plants United States, California, Pacific Northwest, Oregon, Washington
Tolerance Deer
Attracts Birds, Butterflies
Garden Uses Beds and Borders
Garden Styles Coastal Garden, Informal and Cottage, Prairie and Meadow

Great Plant Combination Ideas with Lupinus - Lupines

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