Coastal bush lupine

Lupinus arboreus Sims

light
Full sun
water
—
tall
1.5 m
wide
2.0 m

Fabaceae

Also called Yellow bush lupine, Tree lupine, Tree lupin

Formerly Lupinus arborescens, Lupinus barilochensis, Lupinus eximius, Lupinus macrocarpus, and 1 more

When it flowers

Not known yet in the tropics: too few flowering observations to read a season from.

Read from iNaturalist photographs of it in flower. A month counts at 50% of the best month's flowering share (smoothed over three months) and 10% of its flowering count, from at least 100 flowering observations in the band.

PetsRHS lists it as toxic to dogs and cats (25 Oct 2026)
PeopleNo safety information yet

If a child, a pet or anyone may have eaten a plant, contact a doctor or vet straight away, or call the National Poisons Information Centre (AIIMS, New Delhi) on 1800 116 117, free and open 24 hours.

Something wrong with it?

About it

Grows as
Subshrub or shrubKew's checklist, not yet checked
Climate
TemperateKew's checklist, not yet checked
Wild in
WC. & SW. California to Mexico (N. Baja California)Kew's checklist, not yet checked
Light
Full sun (6 h or more)Read from RHS, one source
Height
1.5 mRead from RHS and Wikipedia, checked by a majority of its sourcesBacked by both sources. Sources differ: RHS 1.5–2.5 m; Wikipedia 1–1.5 m
Spread
1.5 m to 2.5 mRead from RHS, one source
Flowers
YellowRead from RHS and Wikipedia, checked by a majority of its sourcesBacked by both sources. Sources differ: RHS yellow; Wikipedia purple, yellow
Coldest it survives
-11 °C (USDA zone 8a)Read from RHS and Wikipedia, checked: the middle of what its sources sayHalfway between its 2 sources, which differ. Sources differ: RHS -10 °C; Wikipedia -12 °C

Not known yet: water, heat, hottest it survives.

In other languages (11)

Estonian
puislupiin, puis-hundiuba
Norwegian Bokmål
trelupin
Chinese
木本羽扇豆, 叢羽扇豆, 加州羽扇豆
Lithuanian
Krūminis lubinas
Swedish
gul busklupin
Russian
Люпин древовидный
Spanish
Garbancillo Dorado de chaparral, Altramuz De Chaparral Dorado
Polish
Łubin krzewiasty
French
Lupin arborescent
Slovak
vlčí bôb stromovitý
Welsh
coeden bysedd y blaidd

Where this comes from

A fact “checked by a majority of its sources” was settled by a vote of the pages it was read from, not by a person reading it; one marked “one source” rests on that page alone. Anything else not marked checked has not been checked yet. Where nothing is known, the page says so rather than guess.