Do I need to deadhead my lupines?

Yes, removing spent flower spikes can encourage a second flush of blooms.

They are short lived perennials that often act like biennials.

Plant guide

Large-leaved lupine.

Lupinus polyphyllus

Pronounced loo-PY-nus pol-ee-FY-lus

Also known as Big-leaved lupine, Bigleaf Lupine, Blue-Pod Lupine, Garden Lupin, Garden lupine, Large-leaf lupin, Large-leaved lupin, Largeleaf lupine

Lupinus polyphyllus — Photo by David Thompson (CC BY) via gbif

Lupines are stunning perennials that bring a classic cottage garden feel to your outdoor space. They are famous for their tall, colorful flower spikes that bloom in late spring and early summer. You will love how they add vertical interest to your flower beds.

At a glance

Care level: Moderate
Plant type: Perennial
Light: Full sun to partial shade
Indoor light: Bright indirect
Water: Every 5 to 7 days
Mature size: 3 to 5 feet
Growth rate: Medium
Hardiness: USDA 4 to 8
Bloom time: Late spring to early summer

Care

Plant these in a spot with well draining soil to keep the roots happy. Watch for aphids on the flower spikes and trim back the spent blooms to encourage a second flush. Make sure they get plenty of airflow to prevent powdery mildew.

Watering: Keep the soil consistently moist but never soggy.
Feeding: Lupines rarely need feeding because they fix their own nitrogen. If growth is weak, apply a low nitrogen fertilizer rich in phosphorus and potassium once in spring.
Pruning: Deadhead spent flower spikes to promote more blooms.
Repotting: They prefer to stay in the ground, but if in a container, repot only when they become root bound.
Soil: Well draining, slightly acidic soil
Soil pH: 6.0 to 7.0
Temperature: -25 to 30°C
Humidity: 40 to 70%
Drought tolerance: Moderate
Lifespan: Short lived perennial, typically 3 to 5 years.
Fragrance: Light
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Stunted growth despite regular feeding.

Safety

People: All parts of the plant are considered toxic if ingested.
Pets: This plant is considered toxic to cats and dogs if ingested.
Children: Keep children away from the seeds as they are toxic if swallowed.
Contact allergens: Handling the foliage may cause skin irritation in sensitive individuals.
Airborne allergens: The pollen can trigger allergic reactions in some people.
Edibility: The seeds contain alkaloids that are toxic if ingested in quantity.

How to identify it

Tall spikes of pea-like flowers
Palmately compound leaves with many leaflets
Sturdy stems reaching several feet high
Fuzzy texture on stems and leaves

Height: 0.6 to 1.5m
Spread: 0.45 to 0.6m
Leaves: green, deciduous
Flowers: blue, purple, pink, white, yellow, 1 to 2cm
Fruit: brown, Late summer

Problems to watch for

AphidsCommon
Powdery MildewCommon
Root RotUncommon
Slugs and SnailsUncommon

By symptom

Plant problems by symptom

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Growing it

Propagation: seed, cuttings
When to plant: spring, autumn
Overwintering: Cut back the foliage to the ground after it yellows in late autumn. Apply a light layer of mulch to protect the crown from extreme frost.
In containers: They grow well in deep pots, but ensure the container is at least 40 cm deep to accommodate the long taproot.

Seed Scarification

1. Soak seeds in warm water for 24 hours.
2. Nick the seed coat slightly with a file.
3. Sow in pots in early spring.

Plant them near heavy feeders like roses to take advantage of the nitrogen they add to the soil.

Grows well with

Delphinium · They share similar height and bloom timing for a dramatic display.
Columbine · Their delicate foliage contrasts well with the bold lupine spikes.

Similar species

Texas Bluebonnet · A smaller, annual relative with similar flower structure.

Science

Family: Fabaceae
Genus: Lupinus
Order: Fabales
Class: Magnoliopsida
Native range: Western North America
Conservation: It is considered an invasive species in some regions outside its native range.

This plant thrives in open meadows and along stream banks where it fixes atmospheric nitrogen.

Value to wildlife: nectar source, larval host plant
Pollinators: bees, butterflies
Uses: ornamental border, cottage garden, soil improvement

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 5/9
Light: 7/9
Temperature: 4/9
Moisture: 5/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Do I need to deadhead my lupines?: Yes, removing spent flower spikes can encourage a second flush of blooms.
Are they perennial?: They are short lived perennials that often act like biennials.

Where the name comes from

The genus name Lupinus is derived from the Latin lupus, meaning wolf. The species name polyphyllus refers to the many leaflets found on each leaf.

Good to know

The name comes from the Latin word for wolf, reflecting an old myth that the plant steals nutrients from the soil.
Seeds of other lupine species, such as the white lupine, have been used as a food source for thousands of years after proper soaking to remove toxins, but the seeds of this species are toxic and should not be eaten.
They belong to the pea family and produce characteristic seed pods.

Also in

Plants toxic to cats and dogs

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.