Marsh Horsetail
Equisetum palustre
Family: Equisetaceae
What it is like
Equisetum species - horsetail family are Creeping, perenial, Branching rootstocks, rooted at the nodes. The Arial stems may be annual or Perennial, are cylindrical, fluted, simple or with whorled branches at the jointed nodes. The internodes are usually hollow. The Surfaces of the stems are covered with Silica. The Cones are terminal.
Equisetum palustre is a PERENNIAL growing to 0.6 m (2ft). See above for USDA hardiness. It is hardy to UK zone 2. The seeds ripen from May to July. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and can grow in nutritionally poor soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist or wet soil.
Height (m): 0.6
Where it is found
Bogs, fens, marshes and wet heaths, woods and meadows throughout Britain, ascending to 900 metres.
Temperate regions of Europe, including Britain, N. America and Asia.
Conservation Status:
Countries/locations it is found in
How it is used
Food
Rating: 0
Medicine
Rating: 2
Horsetails have an unusual chemistry compared to most other plants. They are rich in silica, contain several alkaloids (including nicotine) and various minerals. Horsetail is very astringent and makes an excellent clotting agent, staunching wounds, stopping nosebleeds and reducing the coughing up of blood. It helps speed the repair of damaged connective tissue, improving its strength and elasticity. An infusion or decoction of the plants has been used in the treatment of constipation, stomach and bowel complaints.
Other
Rating: 3
The stems contain 10% silica and are used for scouring metal and as a fine sandpaper. They can also be used as a polish for brass, hardwood etc. The infused stem is an effective fungicide against mildew, mint rust and blackspot on roses. It also makes a good liquid feed.
Dynamic accumulator: Plants that gather minerals or nutrients from the soil and store them in a more bioavailable form and in high concentration in their tissues. Used as fertilizer or to improve mulch.
How it is grown
We have no information on the needs of this species but, judging by the plant's native habitat, it is likely to require a moist to wet soil in a sunny position. A very cold-hardy species tolerating temperatures down to about -30°c. Plants have a deep and penetrating root system and can be invasive. If grown in the garden they are best kept in bounds by planting them in a large container which can be sunk into the ground.
Propagating it: Spores - best collected as soon as they are ripe in the spring and surface-sown immediately on a sterile compost. Keep moist and pot up as soon as the plants are large enough to handle. Very difficult. Division. The plants usually spread very freely when well sited and should not really need any assistance.
Best place to grow: Woodland Garden Sunny Edge; Dappled Shade; Shady Edge; Meadow; Bog Garden;
Habit: Perennial
Hardiness: 0-0
Growth:
Soil: Light (sandy), medium, heavy (clay)
Shade: Semi-shade, no shade
Moisture: Moist, wet
Things to keep in mind
Large quantities of the plant can be toxic. This is because it contains the enzyme thiaminase, a substance that can rob the body of the vitamin B complex. In small quantities this enzyme will do no harm to people eating an adequate diet that is rich in vitamin B, though large quantities can cause severe health problems. The enzyme is destroyed by heat or thorough drying, so cooking the plant will remove the thiaminase. The plant also contains equisetic acid - see the notes on medicinal uses for more information.