Oenanthe aquatica

RHS Plant Profile

fine-leaved water dropwort

Other common names

cedig manddail y dŵr

Synonyms

Oenanthe phellandrium

Bogs Herbaceous Perennial

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An extremely poisonous, perennial plant, either floating or terrestrial, about 1-1.5m tall, with small mid-green leaves in fan-shaped segments. Small 5-petaled white flowers bloom in compound umbels, from early summer to early autumn

Position

Full sun, Partial shade

Soil Types

Clay, Loam

Max Height

1-1.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 1-1.5 metres

Growing Conditions

Clay Loam

Moisture: Poorly–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or 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): H7

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Apiaceae
Native to GB/Ireland: Yes
Foliage: Deciduous, Semi evergreen
Habit: Clump forming, Floating
Potentially harmful: TOXIC if eaten. Wear gloves and other protective equipment when handling TOXIC to pets if eaten (dogs) - 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

How to Grow

Cultivation

Grows naturally in damp meadows and near ditches and ponds and has the potential to become a nuisance if left unchecked. For a list of alterntive plant to use in ponds and streams, please go to our advice profile on bog gardens and pond plants

Propagation

Propagate by division in late spring

Suggested planting locations and garden types

Wildlife gardens

Pruning

No pruning required

Pests

Generally pest-free, but may be susceptible to slugs and snails

Diseases

Generally disease-free