Eupatorium heterophyllum

Eupatorium cannabinum, commonly known as hemp-agrimony, is a herbaceous plant in the family Asteraceae. It is a robust perennial native to Europe, Northwestern Africa, Turkey, Syria, Iran, Iraq, Jordan, the Caucasus and Central Asia, and grows in damp to wet habitats, usually in lowlands but known up to 410 m altitude in Britain. It is cultivated as an ornamental plant and occasionally found as a garden escape in scattered locations in China, the United States and Canada. It is extremely attractive to butterflies, much like buddleia.

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Eupatorium cannabinum is a perennial herb up to 1.75 metres (5.7 feet) tall forming extensive clumps, with the reddish stems covered in small hairs. The leaves are opposite, deeply 3-lobed, occasionally 5-lobed, and have serrated margins. It is dioecious, with racemes of mauve flower heads which are pollinated by insects from July to early September. The flowers are visited by many types of insects, and have a generalised pollination syndrome. The flower heads are composed of dense clusters of 2–5 mm long florets of fluffy appearance, and can be pink or purple, or rarely whitish. The fruit is an achene about 2 or 3 mm long, borne by a pappus with hairs 3 to 5 mm long, which is distributed by the wind. The plant over-winters as a hemicryptophyte.