Eupatorium cannabinum
Water thistle
Common names: Water hemp, Water ragwort
Photo: Burkhard Mücke · CC BY-SA 4.0 · Source
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Description
Water thistle (Eupatorium cannabinum) is a native perennial that can reach up to 1.5 m in damp habitats. From July to September it produces large, pinkish flower heads that attract butterflies and other insects. The species name refers to its hemp‑like leaf shape; it is not related to true hemp. Historically it was used in herbal medicine, but today its ecological value is emphasized. The plant is toxic—consumption of any part can be harmful.
Care instructions
Choose a moist to wet site in full sun or partial shade, such as a pond edge or near a rain barrel. The soil may be heavy and fertile; the plant tolerates waterlogging better than drought. Water regularly during hot summer weeks, especially when young. Prune stems low to the ground in late winter (late February to early March) to encourage vigorous spring regrowth. Leave spent flower heads into autumn; they provide seed and winter habitat for birds and insects.
Soil & site
Soil pH
Soil type
moist, nutrient-rich, humus-rich, loamy
Feeding
Medium feeder
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