Allium porrum 'Porbella'

RHS Plant Profile
leek 'Porbella'
Award of Garden Merit
Herbaceous Perennial Herbs - Culinary

A perennial usually grown as an annual, with long, lance-shaped, dark green leaves arching over as they grow. The leaf-bases are wrapped around each other to form the edible 'stem', usually blanched white. If not harvested, plants will go on to flower in summer, producing strong, upright stems to 1.5m topped with a rounded flowerhead of small, star-shaped, white flowers. This is a well-flavoured leek cultivar, with thick stems, standing well for several months, to allow cropping from mid-autumn to late winter

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
East–facing or South–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Amaryllidaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Clump forming
Genus
Allium are bulbous herbaceous perennials with a strong onion or garlic scent, linear, strap-shaped or cylindrical basal leaves and star-shaped or bell-shaped flowers in an umbel on a leafless stem
Name Status
Unresolved

How to Grow

Cultivation

Grow in well-drained soil, rich in organic matter, ideally in sun though will tolerate shade. Start seed in containers or a seed bed in spring, then transplant seedlings when pencil thickness into holes 15cm deep, so the lower part of the stem will be blanched. Earthing-up the stems as they grow will increase the length of white stem. See leek cultivation

Propagation

Propagate by seed. See sowing vegetable seeds

Pruning

No pruning required

Pests

May be susceptible to slugs and snails, leek moth, onion fly and onion thrips

Diseases

May be susceptible to leek rust, onion white rot, downy mildews, foot and root rots, fungal leaf spots and smuts