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Mentha aquatica (Watermint)

Beginner
skill rating
1 hour care
per year
0.9m
Max height
1m
Max spread
2-5 years
To maturity

Plant details

Botanical name

Mentha aquatica

Other names

Watermint, Fish mint

Genus

Mentha Mentha

Species

M. aquatica - M. aquatica is a rhizomatous, aquatic or semi-aquatic perennial with lanceolate, dark green, fragrant, toothed, leaves and whorls of lilac flowers in summer.


Mentha aquatica is: Deciduous

Fragrance

Foliage is highly fragrant.

Habit

Spreading

Flower

Lilac in Summer

Foliage

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

How to care

Watch out for

Specific pests

Caterpillars , Leafhoppers Caterpillars , Leafhoppers

Mint rust , Powdery mildew Mint rust , Powdery mildew

General care

Propagation methods

Division, Seed


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Where to grow

Mentha aquatica (Watermint) will reach a height of 0.9m and a spread of 1m after 2-5 years.

Suggested uses

Aquatic, Bees (attract & feed bees), Bog garden, Cottage/Informal, Waterside, Wildlife

Cultivation

Though tolerates a wide range of conditions, grows best in sun in slightly acid boggy soil, at pond margins or directly in water up to 15cm deep.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Boggy damp conditions, Pond/In water

Soil pH

Acid, Neutral

Light

Full Sun

Aspect

South, East, West

Exposure

Exposed, Sheltered

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

Hardy (H4)

Companion plants

We do not currently have companion plants added for this plant.

Botanical name

Mentha aquatica

Other names

Watermint, Fish mint

Genus

Mentha Mentha

Species

M. aquatica - M. aquatica is a rhizomatous, aquatic or semi-aquatic perennial with lanceolate, dark green, fragrant, toothed, leaves and whorls of lilac flowers in summer.

Foliage

Deciduous

Fragrance

Foliage is highly fragrant.

Habit

Spreading


Colour

Flower

Lilac in Summer

Foliage

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


How to care

Watch out for

Specific pests

Caterpillars , Leafhoppers

Specific diseases

Mint rust , Powdery mildew

General care

Propagation methods

Division, Seed


Monthly care advice


Where to grow

Mentha aquatica (Watermint) will reach a height of 0.9m and a spread of 1m after 2-5 years.

Suggested uses

Aquatic, Bees (attract & feed bees), Bog garden, Cottage/Informal, Waterside, Wildlife

Cultivation

Though tolerates a wide range of conditions, grows best in sun in slightly acid boggy soil, at pond margins or directly in water up to 15cm deep.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Boggy damp conditions, Pond/In water

Soil pH

Acid, Neutral

Light

Full Sun

Aspect

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

Defra's Risk register #1

Plant name

Mentha aquatica (Watermint)

Common pest name

Green semi-looper

Scientific pest name

Chrysodeixis eriosoma

Type

Insect

Current status in UK

Absent

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

3

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

3

General biosecurity comments

Polyphagous moth pest which is morphologically identical to a pest already established in the UK in protected environments and being controlled by IPM. Not expected to cause greater impacts than other species of Chrysodeixis in the UK.

Defra's Risk register #2

Plant name

Mentha aquatica (Watermint)

Common pest name

tomato thrips

Scientific pest name

Ceratothripoides brunneus

Type

Insect

Current status in UK

Absent

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

3

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

3

General biosecurity comments

Thrips present in Africa; the Caribbean and parts of Asia; frequently intercepted in the UK. Can cause significant damage to tomatoes and other crops in countries where it is present. Europe wide PRA will consider its potential to establish and cause damage.

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: Chalky, Clay, Loamy, Sandy (will tolerate most soil types) Tell us...
Soil drainage: Boggy damp conditions, Pond/In water Tell us...
Soil pH: Acid, Neutral Tell us...
Light: Full Sun Tell us...
Aspect: South, East, West Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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