Lupinus polyphyllus 'Downer's Delight' (Large-Leaved Lupine) — Perennial

Overview

Lupinus polyphyllus 'Downer's Delight' is a perennial in the genus Lupinus, part of the Fabaceae family. It typically grows around 1.5 m tall. Lupinus polyphyllus 'Downer's Delight' grows best in full sun, and tolerates most soils. Its UK hardiness is rated H7. Suggested uses include borders, cottage gardens and cut flowers. It is native to Western North America.

About the genus

Lupinus, commonly known as lupin, lupine, or regionally bluebonnet, is a genus of plants in the legume family Fabaceae. The genus includes over 199 species, with centres of diversity in North and South America. Smaller centres occur in North Africa and the Mediterranean.

Wikipedia contributors, "Lupinus", CC BY-SA 4.0 — Lupinus

In the garden

Lupinus polyphyllus 'Downer's Delight' is a perennial member of the lupine group, originating from western North America. It reaches roughly 1.5 m and carries its flower spikes through June to August, offering a strong vertical element in summer beds. Site this lupine in full sun on soil that remains moist but drains freely; it accepts sandy, loamy or clay textures. In UK hardiness terms it is H7, meaning it is fully hardy through typical British winters, and it also corresponds to USDA zones 5–9. Provide an open, sunny aspect and avoid areas where water collects around the crown. Use 'Downer's Delight' towards the rear of a mixed border or within a cottage-style bed where a tall, upright plant is useful. Flower stems are suitable for cutting during the June–August season, extending its value beyond the garden border. Allow space for its height when planning adjacent lower plants so the flower spikes remain visible from paths and seating areas.

Growing conditions

Best soil and position for Lupinus

Sunlight: Full sun
Soil type: Sandy, Loamy, Clay
Soil moisture: Moist but well-drained
Exposure: Full sun
UK hardiness: H7

Plant details

Lupinus polyphyllus 'Downer's Delight' size, habit and characteristics

Plant type: Perennial
Height: 1.5 m
Suggested uses: Borders, Cottage gardens, Cut flowers
Native to: Western North America

Care notes

Pruning and caring for Lupinus polyphyllus 'Downer's Delight'

Cultivation: Prefers moist, well-drained soil; avoid waterlogging; mulch to retain moisture; supports pollinators
Pruning: Deadhead spent flowers to encourage more blooms; cut back after flowering to promote bushiness
Propagation: Seed, Division

Frequently asked questions

How do I grow Lupinus polyphyllus 'Downer's Delight'?

Prefers moist, well-drained soil; avoid waterlogging; mulch to retain moisture; supports pollinators.

Where is the best place to plant Lupinus polyphyllus 'Downer's Delight'?

Lupinus polyphyllus 'Downer's Delight' prefers full sun. It suits full sun positions.

What soil does Lupinus polyphyllus 'Downer's Delight' need?

Lupinus polyphyllus 'Downer's Delight' is adaptable and grows happily in most soil types, including sandy, loamy and clay. Aim for soil that stays moist but well-drained.

How do I prune Lupinus polyphyllus 'Downer's Delight'?

Deadhead spent flowers to encourage more blooms; cut back after flowering to promote bushiness.

How big does Lupinus polyphyllus 'Downer's Delight' grow?

Lupinus polyphyllus 'Downer's Delight' reaches a height of 1.5 m.

Is Lupinus polyphyllus 'Downer's Delight' hardy in the UK?

Lupinus polyphyllus 'Downer's Delight' has an RHS hardiness rating of H7, meaning it is fully hardy throughout the UK, tolerating temperatures below -20°C.