Plant Profile

Shady horsetail

Compiled by the Omnia Sana editorial team from the plant database ·Last updated August 15, 2026

Equisetum pratense

Family: Equisetaceae · Parts used: Aerial parts, Stem · Also known as: meadow horsetail

The complete database record: 1 documented constituent, 2 pharmacological actions, 1 traditional / indicated use, with 7 cited sources.

Botanical Description

Perennial, spore-bearing plant closely related to field horsetail, with a similar deep black rhizome. It is distinguished by its more delicate, softly drooping, finely branched sterile stems, which give the plant a lacier, more feathery appearance than the coarser field horsetail, and by its preference for shaded, woodland-edge habitats.

Height: 20-50 cm

Habit: Perennial, spore-bearing herb with delicate, drooping, finely branched sterile stems

Leaves: Reduced to small, fused, toothed sheaths at each stem node

Flowers: None; reproduces by spores borne in a cone on separate fertile stems in spring

Stem: Slender, hollow, jointed, with fine, softly drooping whorled branches

Root: Deep, black, jointed rhizome

Fruit: Spores released from the fertile cone, not a true fruit

Flowering Period: Not applicable (spore-bearing); fertile stems appear in spring

Habitat & Distribution

Grows in shaded woodland edges, damp meadows and streamside thickets, generally in cooler and more shaded sites than field horsetail; found across Europe, Asia and North America.

Harvesting

The aerial (sterile) stems are cut in summer and dried; because this species is easily confused with other horsetails, including the more toxic marsh horsetail, careful identification is essential before wild-harvesting.

Parts: Aerial parts, Stem

Season: Summer

Key Constituents

Phenolic acids and flavonoids (polyphenolic derivatives)^[1]

Pharmacological Actions

Antioxidant^{[1, 2]}

Ethanolic extracts of the sterile stems of Equisetum pratense show free-radical-scavenging activity attributed to their polyphenolic and flavonoid content.

Neuroprotective / cognition support^[1]

In zebrafish models, Equisetum extracts (including E. pratense) showed neuroprotective and anxiolytic/antidepressant-like effects.

Traditional & Indicated Uses

Cardiovascular / heart health^[3]Preliminary · 2/10

An early animal pharmacology study reported that an Equisetum pratense extract improved tolerance to myocardial hypoxia.

Evidence: 2

Label: Cardiovascular / heart health

more plants for cardiovascular / heart health →detailed sources →

Traditional Use & History

Meadow (shady) horsetail shares the broader horsetail genus's traditional folk reputation as a diuretic, astringent and wound-healing herb, though it has been studied far less than field horsetail and has no dedicated clinical evidence base of its own.

Safety, Cautions & Contraindications

Safety noteCaution

Shady horsetail (Equisetum pratense) shares the horsetail genus's traditional use as a diuretic, astringent and wound-healing herb, but it has been studied far less than field horsetail (E. arvense) and almost no clinical data exist. As with other horsetails, prolonged use is cautioned because the genus contains the enzyme thiaminase, which can degrade vitamin B1; products are best sourced as thiaminase-inactivated preparations. Not evaluated for safety in pregnancy or lactation.

Dangerous Lookalikes

Equisetum Palustre^{[5, 6, 7]}Dangerous

Confused Part: Sterile green stems gathered and dried for horsetail tea; toxic marsh horsetail looks very similar and grows in the same damp ground.

Confusion Context: Meadow horsetail (Equisetum pratense) is gathered for horsetail tea, but horsetails are notoriously hard to tell apart, and marsh horsetail (Equisetum palustre) - one of the most poisonous plants of wet grasslands - grows in the same damp habitat and looks very similar. Marsh horsetail contains the alkaloids palustrine and palustridiene plus high thiaminase (which destroys vitamin B1); it is a well-known livestock poison, and peer-reviewed work stresses that medicinal horsetail must be properly authenticated and differentiated from the more toxic marsh horsetail, which can adulterate herbal material. Because the species are so alike, unverified wild horsetail is a real hazard.

Distinguishing Features: Branch teeth: marsh horsetail (the toxic one) has 5-6 teeth on each branch sheath that lie flat (appressed) against the branch. Broad, spreading teeth in threes or fours indicate a non-toxic horsetail rather than marsh horsetail., Branches solid vs hollow: marsh horsetail has hollow branches, whereas field horsetail's branches are solid. A hollow first branch segment is a warning sign., First branch segment vs sheath: on marsh horsetail the lowest segment of each side branch is short - shorter than or about equal to the stem sheath it emerges from. A first branch segment clearly longer than the sheath indicates it is NOT marsh horsetail. Marsh horsetail also favours wet, marshy ground and fens.

Key Test: Because horsetails are so alike and marsh horsetail is poisonous, only use wild horsetail if you can positively exclude marsh horsetail (Equisetum palustre): confirm branch sheaths have 3-4 spreading teeth (not 5-6 flat-lying ones), solid (not hollow) branches, and a first branch segment longer than the stem sheath. If you cannot confirm all of these - or the plant grows in wet, marshy ground - do not use it.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-07

Harvest Readiness

^[4]

Part: stem

Signals: Cut the green, fully branched sterile stems once the whorls of slender branches have expanded - that is, after the cone-bearing stems have shed their spores and themselves greened up and branched.

Basis: traditional

Source Quote: both types produced at the same time, but those bearing cones remaining non-green and unbranched until after spore dispersal, and only later becoming green and branching so as to resemble the sterile stems vegetatively

Species Confirmed: 1

Notes: Horsetails of Britain and Ireland (DELTA/Intkey) species account for Equisetum pratense Ehrh. (REF-3376) - a species-specific flora, so no congener timing is inherited from Equisetum arvense. PFAF had given only spore-ripening dates for this species. Single lineage -> provisional. SAFETY: marsh horsetail (Equisetum palustre) is a toxic lookalike - see Dangerous Lookalikes.

External Identifiers

GBIF ›Wikidata ›

References & Sources

Batir-Marin, D., Boev, M., Cioanca, O., Mircea, C., Burlec, A.F., Beppe, G.J., Spac, A., Corciova, A., Hritcu, L. and Hancianu, M (2021) 'Neuroprotective and antioxidant enhancing properties of selective Equisetum extracts', Molecules, 26(9), pp. 2565. doi:10.3390/molecules26092565 Preclinical
https://doi.org/10.3390/molecules26092565
Batir-Marin, D., Mircea, C., Boev, M., Burlec, A.F., Corciova, A., Fifere, A., Iacobescu, A., Cioanca, O., Verestiuc, L. and Hancianu, M (2021) 'In vitro antioxidant, antitumor and photocatalytic activities of silver nanoparticles synthesized using Equisetum species: a green approach', Molecules, 26(23), pp. 7325. doi:10.3390/molecules26237325 Preclinical
https://doi.org/10.3390/molecules26237325
Chang, F.J. and Su, Y.M (1985) 'Pharmacological studies of the extract of Equisetum pratense on the tolerance to myocardial hypoxia in animals', Zhong Xi Yi Jie He Za Zhi, 5(12), pp. 744-746. Preclinical
https://scholar.google.com/scholar?q=Pharmacological%20studies%20of%20the%20extract%20of%20Equisetum%20pratense%20on%20the%20tolerance%20to%20myocardial%20hypoxia%20in%20animals
Dallwitz, M. J. and Paine, T. A. and Zurcher, E. J 'Horsetails of Britain and Ireland - Equisetum pratense Ehrh'. Available at: https://www.delta-intkey.com/britht/www/pratense.htm Traditional / reference
https://www.delta-intkey.com/britht/www/pratense.htm
NatureSpot 'Marsh Horsetail - Equisetum palustre'. Available at: https://www.naturespot.org/species/marsh-horsetail Traditional / reference
https://www.naturespot.org/species/marsh-horsetail
Muller, J. and Puttich, P.M. and Beuerle, T (2020) 'Variation of the Main Alkaloid Content in Equisetum palustre L. in the Light of Its Ontogeny', Toxins, 12(11), pp. 710. doi:10.3390/toxins12110710 Preclinical
https://doi.org/10.3390/toxins12110710
Ibi, A. and Du, M. and Beuerle, T. and Melchert, D. and Solnier, J. and Chang, C (2022) 'A Multi-Pronged Technique for Identifying Equisetum palustre and Equisetum arvense - Combining HPTLC, HPLC-ESI-MS/MS and Optimized DNA Barcoding Techniques', Plants, 11(19), pp. 2562. doi:10.3390/plants11192562 Preclinical
https://doi.org/10.3390/plants11192562

Selected studies & references

PreclinicalIn vitro antioxidant, antitumor and photocatalytic activities of silver nanoparticles synthesized using Equisetum species: a green approach source↗ (2021)

PreclinicalNeuroprotective and antioxidant enhancing properties of selective Equisetum extracts source↗ (2021)

PreclinicalPharmacological studies of the extract of Equisetum pratense on the tolerance to myocardial hypoxia in animals source↗ (1985)

All 3 studies in the Knowledge Finder →

Educational use only. This profile summarises traditional and scientific sources for reference. It is not medical advice and not a substitute for a qualified practitioner. Some plants carry safety cautions and drug interactions - always check before use.
This profile is assembled automatically from the Omnia Sana plant database, which we curate by hand. How this site is built.

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