Also known as Altramuz Azul · Blue Lupin · Blue Lupine
Safety note: This plant may be toxic to humans and pets. See toxicity details.
Narrow-leaved Lupine (Lupinus angustifolius) is a nitrogen-fixing annual legume with striking blue flower spikes, valued for soil improvement and ornamental appeal.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
100% intensity
Prefers at least 6-8 hours of direct sunlight daily for best flowering.
Moderate
50% intensity
Water when topsoil is dry, ensure good drainage.
Well-drained, Sandy, Loamy
50% intensity
Moderate
50% intensity
Thrives in cool to moderate temperatures; protect from extreme heat.
Low
25% intensity
Needs very little fertilizer; nitrogen-fixing capabilities provide most needs.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | Yes 5/5 intensity |
| Toxic for pets | Yes 5/5 intensity |
| Edible | No |
Seeds and pods contain toxic alkaloids (lupanine).
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Water Narrow-leaved Lupine consistently when the top 2-3 cm of soil feels dry. Avoid overwatering, which can lead to root rot. Ensure good drainage, especially during hot, dry periods.
Reduce watering in cooler months when the plant is dormant or growing slowly.
Deadhead spent flower spikes to encourage further blooming and prevent seed formation. In autumn, after flowering has finished, cut back the main stems to about 15 cm above the ground.
This tidies the plant and prepares it for winter dormancy, promoting strong new growth next season.
Narrow-leaved Lupine is best propagated by seeds sown directly in the garden in early spring or autumn.
Seeds benefit from scarification (lightly scratching the seed coat) or soaking in warm water overnight to improve germination rates. It can also be propagated by cuttings taken in late spring.
Narrow-leaved Lupine generally dislikes transplanting due to its deep taproot. It is best to sow seeds directly into their final position.
If propagation by seedling is necessary, use biodegradable pots that can be planted directly into the ground to minimize root disturbance when the plant is young.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Narrow-Leaved Lupine (Lupinus angustifolius)
Where Narrow-Leaved Lupine (Lupinus angustifolius) is found
Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Fabales |
| Family | Fabaceae |
| Genus | Lupinus |
| Species | Lupinus angustifolius |
Similar in genus Lupinus
Answers based on plant encyclopedia data
