Eupatorium cannabinum

RHS Plant Profile
hemp agrimony

Other common names

ague weed, andurion, bastard agrimony, common hemp agrimony, Dutch agrimony, hemlock parsley, hemp weed, holy rope, Indian ague root, water agrimony, water hemp, byddon chwerw

Plants for pollinators
Herbaceous Perennial

Vigorous upright perennial to about 1.5m tall, with reddish stems, dark green leaves palmately-divided into narrow leaflets, and dense terminal domed clusters of tiny light pink or purple flowers in late summer and early autumn

Position

Full sun, Partial shade

Soil Types

Clay, Loam

Max Height

1-1.5 metres

Max Spread

1-1.5 metres

Size

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

Growing Conditions

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

Position

Full sun Partial shade
Aspect
West–facing or South–facing or North–facing or East–facing
Exposure
Exposed or Sheltered
Hardiness
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
Yes
Foliage
Evergreen
Habit
Clump forming
Genus
Eupatorium can be annuals, herbaceous perennials, subshrubs or evergreen shrubs, with small tubular flowers borne in terminal panicles or corymbs
Name Status
Correct

How to Grow

Cultivation

Grow in any moist soil in full sun or partial shade. Can spread quickly, but is very attractive to butterflies and other insects

Propagation

Propagate by seed sown in containers in cold frame, or propagate by division in spring

Suggested planting locations and garden types

  • Wildflower meadow
  • Wildlife gardens
  • Coastal
  • Cottage and informal garden
  • Flower borders and beds

Pruning

Cut back spent flowers at end of the flowering season

Pests

May be susceptible to slugs and aphids

Diseases

Generally disease-free