Hemp agrimony (Eupatorium cannabinum)

Hemp agrimony

Also known as: Water hemp agrimony

Hemp agrimony (Eupatorium cannabinum) is a perennial that is native to Europe and is sometimes cultivated as an ornamental plant in parts of China and North America. In summer through fall hemp agrimony produces pink or purple flowers that are highly attractive to butterflies and other pollinators.

Scientific classification

Species

Hemp agrimony (Eupatorium cannabinum)

Asters bellflowers fanflowers and allies

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Perennial, Annual

Lifespan

Herb

Plant Type

Summer, Fall

Bloom Time

Winter, Early spring, Mid spring, Summer, Fall

Harvest Time

1.5 m

Plant Height

Black

Fruit Color

Pink, Purple, White

Flower Color

Green, Purple, Pink

Stem Color

Deciduous

Leaf type

20 - 35 ℃

Ideal Temperature

Images of Hemp agrimony

Distribution of Hemp agrimony

Distribution Map

The plant hemp agrimony is widely established within its native range in Europe and Asia, while it has also been introduced to subtropical regions. Although hemp agrimony is cultivated in various locations for ornamental or other purposes, it has become naturalized in some areas outside its natural habitat. In certain regions, hemp agrimony may be perceived as a plant that could have an impact on local ecosystems. Its presence is not necessarily disruptive, but it sometimes raises concerns due to its potential to thrive in non-native environments.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Streamsides, low damp sites, woods

Hemisphere Trend Curve

Northern

Sorthern

Culture

Garden Use

Hemp agrimony is a water-loving plant that is generally grown for its beauty and attractiveness to pollinators. Besides its usefulness in humid pollinator gardens, it does well planted next to water features such as ponds and can add beauty to a rain garden.

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Toxicity

Hemp agrimony possesses a moderate toxicity risk to humans, cats, and dogs due to the presence of pyrrolizidine alkaloids in its entire plant. Ingestion of any part can cause gastrointestinal distress, liver damage in humans, and vomiting or lethargy in animals. Immediate veterinary care is recommended for pets that ingest hemp agrimony to mitigate potential adverse reactions.

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Care Guide for Hemp agrimony

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Originating from damp environments, hemp agrimony thrives in consistently moist soil and should be watered weekly for optimal hydration. Although moderately drought-tolerant, hemp agrimony's growth is linked to seasonal rainfall and temperature fluctuations, particularly as it is commonly grown outdoors.

Fertilize: For optimal growth, hemp agrimony requires balanced fertilizers (10-10-10 NPK) every 4 to 6 weeks during spring and summer, tapering in fall and stopping in winter. Careful dosage is essential to avoid root burn; new gardeners should use half-strength solutions and always water thoroughly after fertilizing.

Pruning: Hemp agrimony is a perennial with pinkish-purple flowers needing early spring pruning for vigor and shape. Cut old stems to ground level to enhance airflow and promote blooming. Use clean, sharp tools to prevent disease, ensuring healthy, robust plants throughout the growing season.

Propagation: For successful propagation of hemp agrimony, divide healthy clumps, ensuring each section has roots. Replant in moist, well-draining soil at the same depth. Water moderately to prevent root rot. With care, new hemp agrimony plants will thrive, reflecting the growth of the parent plant.

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