Oenanthe pimpinelloides

RHS Plant Profile
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Herbaceous Perennial
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A UK native perennial, found mostly in southern England. Upright, hollow, fluted stems reach about 1m, with highly divided, fern-like leaves and small white flowers in light umbels in summer

Position

Full sun

Soil Types

Chalk, Clay, Loam

Size

Time to Maturity
2–5 years

Growing Conditions

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

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Apiaceae
Native to GB/Ireland
Yes
Foliage
Deciduous
Habit
Clump forming
Potentially harmful
TOXIC if eaten. Wear gloves and other protective equipment when handling TOXIC to pets if eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus
Oenanthe are perennials with a preference for damp ground, marshes or water. Hollow stems are shiny and can grow up to 2m tall. Leaves are triangular, shiny and bright green and flowers are arranged in small white clusters. Brown, rugby-shaped seeds follow the flowers.
Name Status
Correct
Plant Range
Europe, SW Asia

How to Grow

Cultivation

Occurs naturally in old, unimproved, dry or damp grassland, and in moist spots beside roads, ponds or ditches. Prefers low fertility, alkaline soil in a sunny position

Propagation

Propagate by division of tubers or propagate by seed

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wildflower meadow
  • Wildlife gardens

Pruning

Deadhead if seed is not required

Pests

Generally pest-free

Diseases

Generally disease-free