Hemp agrimony

Eupatorium cannabinumAsteraceaeHerbaceous perennial

A tall damp-ground perennial with flat heads of dusty pink flowers in late summer, and among the most heavily insect-visited plants in northern Europe. It flowers when the meadow season is closing and is one of the best plants there is for butterflies, hoverflies and late bees together.

Value to bees

Nectar
Very high
Pollen
High
As a honey crop
Minor honey crop — a surplus only locally or occasionally
Which bees, and why
The flat head of tiny shallow florets acts as a landing platform and is accessible to almost every insect. It is one of the best butterfly plants in northern Europe and equally good for bees, hoverflies and beetles.

Flat heads of tiny shallow florets on a broad platform — the most accessible arrangement there is.

Worth knowing
An outstanding late-summer nectar source and one of the more productive plants in a European garden for its size.

Flowering

In flower
July to September (northern hemisphere)

A late summer flow, running when much of the meadow has finished.

Growing it

Conditions
Sun or part shade on damp to wet soil. It thrives in ground too wet for most border plants.
Size
1-1.5 m tall.
Native range
Europe, North Africa and western Asia, on damp ground, riverbank, fen, ditch and woodland ride.
Suits
Large gardens, Meadow or wildflower area, Small gardens
  • Excellent for a pond margin, damp border or rain garden.
  • Cut back in late winter rather than autumn — the hollow stems shelter overwintering invertebrates.
  • Self-seeds moderately in damp ground; deadhead if that is unwelcome.

What it looks like

A tall upright perennial with hemp-like three-lobed leaves and broad flat-topped heads of fluffy dusty-pink florets, giving a soft hazy appearance.

Sources

  • Field Guide to the Bees of Great Britain and IrelandBloomsbury (2015) · Field guide
  • Assessment Report on Pollinators, Pollination and Food ProductionIntergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) (2016) · Systematic review Link

How sources are selected and weighted is set out in the sources and evidence policy.

Guides covering this plant

Tools for planning planting

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