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Eupatorium cannabinum (Hemp agrimony)

Beginner
skill rating
1 hour care
per year
1.2m
Max height
0.8m
Max spread
2-5 years
To maturity

Plant details

Botanical name

Eupatorium cannabinum

Other names

Hemp agrimony, Ague weed, Bastard agrimony, Dutch agrimony, Hemp weed, Indian ague root, Water hemp, Andurion, Common hemp agrimony, Hemlock parsley, Holy rope, Water agrimony

Genus

Eupatorium Eupatorium

Species

E. cannabinum - E. cannabinum is a vigorous, upright, clump-forming perennial with erect, red-flushed stems bearing palmate, toothed, mid- to dark green leaves with narrow leaflets and dense, flat-topped clusters of pink or purple flowers from late summer to early autumn.


Eupatorium cannabinum is: Deciduous

Habit

Clump-forming, Erect flower stem, Upright

Flower

Pink, Purple in Summer; Purple, Pink in Autumn

Foliage

Dark-green in Spring; Dark-green in Summer; Dark-green in Autumn

How to care

Watch out for

Pests

Generally pest-free.

Diseases

Generally disease-free.

General care

Pruning

Cut back in late autumn.

Propagation methods

Division, Seed


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Where to grow

Eupatorium cannabinum (Hemp agrimony) will reach a height of 1.2m and a spread of 0.8m after 2-5 years.

Suggested uses

Architectural, Cottage/Informal, Beds and borders, Prairie planting

Cultivation

Plant in any moist, moderately fertile soil in full sun to partial shade. Water during dry periods until the plant becomes established. May be invasive in beds and borders.

Soil type

Clay, Loamy

Soil drainage

Moist but well-drained, Moisture-retentive

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

Companion plants

Botanical name

Eupatorium cannabinum

Other names

Hemp agrimony, Ague weed, Bastard agrimony, Dutch agrimony, Hemp weed, Indian ague root, Water hemp, Andurion, Common hemp agrimony, Hemlock parsley, Holy rope, Water agrimony

Genus

Eupatorium Eupatorium

Species

E. cannabinum - E. cannabinum is a vigorous, upright, clump-forming perennial with erect, red-flushed stems bearing palmate, toothed, mid- to dark green leaves with narrow leaflets and dense, flat-topped clusters of pink or purple flowers from late summer to early autumn.

Foliage

Deciduous

Habit

Clump-forming, Erect flower stem, Upright


Colour

Flower

Pink, Purple in Summer; Purple, Pink in Autumn

Foliage

Dark-green in Spring; Dark-green in Summer; Dark-green in Autumn


How to care

Watch out for

Pests

Generally pest-free.

Diseases

Generally disease-free.

General care

Pruning

Cut back in late autumn.

Propagation methods

Division, Seed


Monthly care advice


Where to grow

Eupatorium cannabinum (Hemp agrimony) will reach a height of 1.2m and a spread of 0.8m after 2-5 years.

Suggested uses

Architectural, Cottage/Informal, Beds and borders, Prairie planting

Cultivation

Plant in any moist, moderately fertile soil in full sun to partial shade. Water during dry periods until the plant becomes established. May be invasive in beds and borders.

Soil type

Clay, Loamy

Soil drainage

Moist but well-drained, Moisture-retentive

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4

Defra's Risk register #1

Plant name

Eupatorium cannabinum (Hemp agrimony)

Common pest name

Scientific pest name

Coleosporium eupatorii

Type

Fungus

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

2

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

A rust affecting Pinus spp. Pathway for entry mitigated by EU regulation of bonsai imports. The trade of pines and other hosts need to be monitored.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read "Don't risk it" advice here

Suspected outbreak? Click here for contact details to report to the relevant authority.

Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

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This plant likes... Garden match
Soil types: Clay, Loamy Tell us...
Soil drainage: Moist but well-drained, Moisture-retentive Tell us...
Soil pH: Acid, Alkaline, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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