Mercurialis annua

RHS Plant Profile
annual mercury
annual mercury visionspictures.com

Other common names

baron's mercury, boy's mercury, French mercury, girl's mercury, herb mercury, bresychen-y-cŵn flynyddol

Annual Biennial

A annual with an upright, branching habit, growing up to 50cm tall. It has green, lance-shaped leaves, finely serrated up to 6cm long and arranged in opposite pairs along smooth stems. From July to October, it produces small, greenish, petal-less flowers, with male flowers in clusters and female flowers appearing singly or in small groups

Position

Full shade, Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Size

Time to Maturity
1 year

Growing Conditions

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

Position

Full shade Full sun Partial shade
Aspect
East–facing or North–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
Euphorbiaceae
Native to GB/Ireland
Yes
Foliage
Deciduous
Habit
Matforming
Potentially harmful
Pets: Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus
Name Status
Correct
Plant Range
Europe to W Asia

How to Grow

Cultivation

Thrives in disturbed soils in gardens, farmland, roadsides, and waste ground, as well as urban areas, woodland edges, hedgerows, and some coastal regions

Propagation

Self-seeds freely

Suggested planting locations and garden types

  • Wildlife gardens

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free