Toxic if eaten
Toxic - do not eat. The seeds and all parts of garden lupine contain bitter quinolizidine alkaloids and are not edible (unlike specially processed lupini beans, which are a different, treated crop). Poisoning can cause trembling and convulsions, and children are especially sensitive. Grow as an ornamental only.
Lupinus polyphyllus
flowerBig Leaf Lupine is the showy garden lupine, a clump-forming perennial native to the Pacific Northwest that throws dramatic 3 to 5 ft vertical spikes of pea-shaped flowers in blue, purple, pink, white, or bicolor against handsome palmate leaves. As a legume it fixes its own nitrogen and improves the soil, and its spires draw bumblebees and other long-tongued pollinators in droves. Lupines prefer cool summers and short-lived but reseed and divide easily.
Sun
full sun
Water
Every 5 days
Bloom
~45 days
Difficulty
medium
Lifecycle
perennial
Comes back every year
Spacing
18-24 in. apart
Planting Depth
Seed 1/8-1/4 in. deep (scarified, soaked)
Soil pH
5.5-7.0
Soil Type
Well-draining, acidic to neutral
Hardiness Zones
Zones 3 – 7
When to Fertilize
None - lupines fix their own nitrogen
Fertilizer
None; bone meal at planting if soil is very poor
Lupine seed has a hard coat and needs cold stratification - either chill seed in the refrigerator for 8 to 12 weeks before sowing in spring, or sow in fall and let winter do the work. Many growers also nick or sand the coat (scarify) and soak overnight to speed germination. Plant in full sun in well-drained, slightly acidic to neutral soil; lupines hate wet feet and heavy clay. Space plants 18 to 24 in. apart. Do not feed nitrogen - lupines make their own and excess N flops the stalks. Divide established clumps in early spring.
🌼 Have a different variety?Cultivars of the same species usually share the same basic care — they differ mainly in flower color, height, and bloom form, not in how you grow them. So this guide still applies even if your exact variety isn't the one shown.
Start seeds indoors
Feb 18
Transplant outdoors
Apr 1
Projected first bloom
May 16
Good neighbors that attract beneficial insects or deter pests
Proactive ways to stop trouble before it starts — tap a name with an arrow for its full guide
Lupines magnetically attract aphids, particularly the lupine aphid; hose off colonies and plant yarrow or alyssum nearby for hoverflies
Cool damp spring weather brings out slugs that shred emerging shoots; use grit, traps, or handpick at night
Give plants airflow, water at the base, and remove infected lower leaves; mildew tends to follow drought stress
Clean up infected debris in fall and improve drainage; the disease worsens in wet heavy soil
Cut lupine for the vase when about a third of the lowest florets on the spike are open and the rest are still buds; later-stage spikes shatter. Strip the lower leaves, sear the cut stem in hot water for 30 seconds to seal the latex, then condition in cool water overnight. Vase life is about 5 to 7 days. Cut spent spikes back to a basal leaf to encourage a smaller secondary flush.
A pollinator powerhouse: the spires are perfectly built for bumblebees, which lever open the flowers, and they feed native long-tongued bees that other shorter flowers leave hungry. As a nitrogen-fixing legume, lupine also improves soil fertility for the next crop. Note: the seeds of garden lupine contain alkaloids and are not edible - only specific sweet lupin cultivars are food crops.
Toxic - do not eat. The seeds and all parts of garden lupine contain bitter quinolizidine alkaloids and are not edible (unlike specially processed lupini beans, which are a different, treated crop). Poisoning can cause trembling and convulsions, and children are especially sensitive. Grow as an ornamental only.
For educational and informational purposes only — HomeSown is not medical, health, or other professional advice. Always positively identify any plant before handling or eating it; some plants, and some parts of otherwise-edible plants, are toxic. Consult a qualified professional before consuming or otherwise using any plant, especially if you are pregnant, nursing, taking medication, or have a health condition.