Alliaria petiolata

RHS Plant Profile
garlic mustard

Other common names

Jack-by-the-hedge, garlic root, garlic wort, hedge garlic, hedge mustard, poor man's mustard, sauce-alone, garlleg y berth

Synonyms

Alliaria officinalis
Sisymbrium alliaria

Plants for pollinators
Annual Biennial

A hairy biennial herb, which can be variable in height; is usually unbranched and bears heart to kidney-shaped toothed green leaves that emit a pungent garlic odour especially when crushed. Flowers are white from 3-5mm in diameter and born in terminal clusters. Seed capsules are long and slender from 20-70mm in length

Position

Full shade, Partial shade

Soil Types

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

Position

Full shade Partial shade
Aspect
East–facing or North–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness
H6

Colour & Scent

Fragrance Foliage
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Brassicaceae
Native to GB/Ireland
Yes
Foliage
Evergreen
Habit
Bushy
Genus
Alliaria can be annuals, biennials or perennials, with garlic-scented, ovate or heart-shaped leaves and racemes of small, white, 4-petalled flowers in spring
Name Status
Correct

How to Grow

Cultivation

Prefers a rich damp alluvial soil, thriving in damp shady places where few other herbs will grow. A good woodland-edge and hedgerow plant, the plant emits a strong smell of garlic which is especially pronounced if the leaves are bruised. This species is an important food source for the orange-tip and green-veined-white butterflies

Propagation

Propagate by seed as soon as ripe. If sowing in situ, it is best to sow in autumn as it requires a long period of chilling to break dormancy

Suggested planting locations and garden types

  • Wildlife gardens

Pruning

No pruning required

Pests

Susceptible to caterpillar damage

Diseases

Generally disease-free