Allium porrum 'Pendle Improved' (leek 'Pendle Improved') — Clump forming

Overview

Allium porrum 'Pendle Improved' is a clump forming bulbs in the genus Allium, part of the Amaryllidaceae family, with deciduous foliage. Allium porrum 'Pendle Improved' grows best in full sun, and tolerates most soils and any pH. Its UK hardiness is rated H6. Suggested uses include city and courtyard gardens, cottage and informal garden, gravel garden, patio and container plants, wildlife gardens, cut flowers and flower borders and beds.

About

Allium porrum 'Pendle Improved' is a cultivar of leek within the Allium genus, known for bulbous herbaceous perennials with a distinctive onion or garlic aroma. This clump-forming plant has deciduous foliage and thrives in full sun with well-drained soil, suitable for a variety of soil types and pH levels. Hardy to UK zone H6, it is adaptable to both exposed and sheltered sites, making it ideal for city gardens, patios, and wildlife-friendly spaces. Plant bulbs in autumn and allow the foliage to die back naturally, with interest extending from summer through to winter.

About the genus

Allium is a large genus of monocotyledonous flowering plants with 1112 accepted species, making Allium the largest genus in the family Amaryllidaceae and among the largest plant genera in the world. Many of the species are edible, and some have a long history of cultivation and human consumption such as the onion, garlic, scallions, shallots, leeks, and chives.

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

Growing conditions

Best soil and position for Allium

Sunlight: Full sun
Soil type: Chalk, Clay, Loam, Sand
Soil pH: Acid, Alkaline, Neutral
Soil moisture: Well-drained
Aspect: South-facing, West-facing, East-facing
Exposure: Exposed, Sheltered
UK hardiness: H6

Plant details

Allium porrum 'Pendle Improved' size, habit and characteristics

Plant type: Bulbs
Habit: Clump forming
Foliage: Deciduous
Suggested uses: City and courtyard gardens, Cottage and informal garden, Gravel garden, Patio and container plants, Wildlife gardens, Cut flowers, Flower borders and beds

Care notes

Pruning and caring for Allium porrum 'Pendle Improved'

Propagation: Offsets, Seed
Pest resistance: Allium leaf miner, Onion fly
Disease resistance: Onion white rot, Onion downy mildew

Frequently asked questions

Where is the best place to plant Allium porrum 'Pendle Improved'?

Allium porrum 'Pendle Improved' prefers full sun. It suits exposed and sheltered positions.

What soil does Allium porrum 'Pendle Improved' need?

Allium porrum 'Pendle Improved' is adaptable and grows happily in most soil types, including chalk, clay, loam and sand. It is happy in soil of any pH. Aim for soil that stays well-drained.

Is Allium porrum 'Pendle Improved' hardy in the UK?

Allium porrum 'Pendle Improved' has an RHS hardiness rating of H6, meaning it is very hardy, tolerating -20 to -15°C across most of the UK.

How do I propagate Allium porrum 'Pendle Improved'?

Offsets, Seed.

More in the Allium genus

Browse all Allium →