This hybrid species is sometimes treated as Mentha piperita citrata (Ehrh.) Briq., whilst at other times as a cultivated form Mentha aquatica 'Citrata'

Common Name: Eau De Cologne Mint

General Information

Mentha aquatica citrata is a perennial plant that can grow up to 0.30 metres tall.
It is harvested from the wild for local use as a food, medicine and source of materials.
The plant is cultivated on a commercial scale in some countries, and is often planted in home-gardens, especially in Europe, Mexico, Guatemala and Cuba, as an aromatic plant or for the preparation of herbal tea[].

Known Hazards

Although no specific mention has been seen for this sub-species, it should be noted that, in large quantities, the closely allied M. x piperita vulgaris can cause abortions, especially when used in the form of the extracted essential oil, so it should not be used by pregnant women.

Botanical References

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Range

A form probably of garden origin, it is not known in a truly wild situation.

Habitat

A natural hybrid, Mentha aquatica x Mentha spicata found in moist soils on the sides of ditches, roadsides etc in southern England[, ].

Properties

Edibility Rating
Medicinal Rating
Other Uses Rating
Habit	Perennial
Height	0.30 m
Pollinators	Bees, Lepidoptera, Insects
Cultivation Status	Cultivated, Wild

Cultivation Details

Mentha aquatica citrata is a very cold-hardy plant, able to tolerate temperatures down to around -35°c when fully dormant[]
A very easily grown plant, it succeeds in most soils and situations so long as the soil is not too dry[, ]. Grows well in heavy clay soils. A sunny position is best for the production of essential oils, but the plant also succeeds in partial shade. Prefers a slightly acid soil[]. Plants are very tolerant of neglect, succeeding in long grass[].
Hybridizes freely with other members of this genus.
Mentha species are very prone to hybridisation and so the seed cannot be relied on to breed true. Even without hybridisation, seedlings will often not be uniform and so the content of medicinal oils etc will vary. When growing plants with a particular aroma it is best to propagate them by division[].
Most mints have fairly aggressive spreading roots and, unless you have the space to let them roam, they need to be restrained by some means such as planting them in containers that are buried in the soil[]. This mint will need to be grown in containers to prevent it spreading too aggressively into the other plants.
The whole plant has a strong minty aroma with a hint of ginger[]. The plant produces a better quality essential oil if the plant is grown in dry ground[].
Members of this genus are rarely if ever troubled by browsing deer[].

Edible Uses

Leaves - raw or cooked. Used as a flavouring in salads or cooked foods[]. A very pungent flavour, the leaves of the true eau-de-cologne mint are too aromatic for most tastes, though the cultivar 'Basil' has an excellent flavour and makes a very good substitute for basil in pesto[].

A herb tea is made from the fresh or dried leaves[, ].

Medicinal

Eau de Cologne mint, like many other members of this genus, is often used as a domestic herbal remedy, being valued especially for its antiseptic properties and its beneficial effect on the digestion. Like other members of the genus, it is best not used by pregnant women because large doses can cause an abortion.

The leaves and flowering plant are anodyne, antiseptic, antispasmodic, carminative, cholagogue, diaphoretic, refrigerant, stomachic, tonic, vasodilator[, , , ]. A tea made from the leaves has traditionally been used in the treatment of fevers, headaches, digestive disorders and various minor ailments[]. The medicinal uses of this herb are more akin to lavender (Lavandula spp) than the mints. It is used to treat infertility, rapid heartbeat, nervous exhaustion etc[].
The leaves are harvested as the plant comes into flower and can be dried for later use[].

The essential oil in the leaves is antiseptic, though it is toxic in large doses[].

Agroforestry Uses:

Mint species are usually good bee and butterfly attractant plants, supplying them with good quality pollen and nectar[]
Mints are usually quite aromatic plants and they make good companions for cabbages and tomatoes, their aromatic nature helping to repel insect pests..

Other Uses

An essential oil obtained from the whole plant is a source of lavender oil which is used in perfumery[, , ]. It is also used in oral hygiene preparations, toiletries etc[].
The plant is a source of bergamotte oil, which smells like a combination of lavander and lemon and is mainly used in the perfume industry[]

Formerly used as a strewing herb[], the plant repels insects, rats etc[, , ]. Rats and mice intensely dislike the smell of mint. The plant was therefore used in homes as a strewing herb and has also been spread in granaries to keep the rodents off the grain[].

Propagation

Seed - sow spring in a cold frame. Germination is usually fairly quick. Prick out the seedlings into individual pots when they are large enough to handle and plant them out in the summer. Mentha species are very prone to hybridisation and so the seed cannot be relied on to breed true. Even without hybridisation, seedlings will not be uniform and so the content of medicinal oils etc will vary. When growing plants with a particular aroma it is best to propagate them by division[].
Division can be easily carried out at almost any time of the year, though it is probably best done in the spring or autumn to allow the plant to establish more quickly. Virtually any part of the root is capable of growing into a new plant. Larger divisions can be planted out direct into their permanent positions. However, for maximum increase it is possible to divide the roots up into sections no more than 3cm long and pot these up in light shade in a cold frame. They will quickly become established and can be planted out in the summer.