Join the RHS today and support our charitable work
Keep track of your plants with reminders & care tips – all to help you grow successfully
For the latest on RHS Shows in 2020 and 2021, read more
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Free entry to RHS members at selected times »
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Help us achieve our goals
Join the RHS today and support our charity
We have combined these two powerful search tools into a single Find a Plant service searching over 250,000 plant records.
Virtually all of the features of the old searches are still available and in addition we have added several new features to create a more comprehensive and user friendly search experience.
When using this search
Search by plant name, key attributes or both to find plant details and a list of
AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
the RHS today and get 12 months for the price of 9
Other common names
Jack-by-the-hedge garlic mustard
Sisymbrium alliaria Alliaria officinalis
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
A. petiolata is 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
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
Aspect East-facing or North-facing or West-facing
Exposure Sheltered or Exposed
MoistureMoist but well-drained
SoilSand, Chalk, Loam
pHAlkaline, Neutral, Acid
Time to ultimate height
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
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
Pruning No pruning required
Pests Susceptible to caterpillar damage
Generally trouble free
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.