Tuesday, March 24, 2015

How to eat a Horsetail

Spring has arrived. The cheerful song of the American Robin wakes me up each morning, their is enough daylight for late afternoon frivolities, and the Western Chorus frogs are calling so jubilantly into the night now that they would put me to sleep if I wasn’t so excited to hear them. I open the window and cock my ear to the side to take in the sound that is occasionally audible over the constant grumble of the highway! In the woods the Bigleaf Maple flowers are popping out of their over-sized buds and the birches have given their last drops of sweet water. Like the leggy frogs that leap enthusiastically in the warm air after a winter burrowed in frigid mud, the plants too seem to be springing from the ground. Nettles grow visibly between my every-other day harvests and an often overlooking edible—Giant Horsetail—claims its place in the front of the seasonal line-up of tasty shoot vegetables.

In the Pacific Northwest we have several species of horsetail. Two are edible, three are useful as sandpaper, and the remaining are neither useful to humans, nor common (limited to sloughs and marshes). Following are descriptions of the edible species.

Giant Horsetail (Equisetum telmateia) description
Giant Horsetail is an herbaceous clonal species. New shoots emerge from an underground network of rhizomes beginning in early to mid-March. There are two types of shoots, the fertile (spore bearing) shoots appearing a week ahead of the vegetative shoots. Fertile shoots are ½-3/4” (1.5-2 cm) wide and 1-2’ (30-60 cm) tall. The stems elongate between nodes which are covered with papery brown bracts. At the top of each fertile shoot is a cone-like structure (strobilus) that changes from green to white and eventually matures to brown when it begins releasing spores. The vegetative shoots are slightly narrower and taller at 3/16-3/4” (5-20 mm) wide and 1.5-4’ (50-120 cm) tall. The nodes of the vegetative shoots are also surrounded by brown papery bracts, but they smaller giving room for the rings of needle like leave that give the plant its namesake appearance. The features that distinguish Giant Horsetail are most easily noticed in cross-section. A cross section of the vegetative shoots shows a large hollow center that is much wider than twice the thickness of the walls, and a cross section of the needle like leaves shows that they are rounded.

This oddball has both photosynthetic branches and a reproductive strobilus

Giant Horsetails grow at low elevations in loose, damp soil. They are found from Bella Coola and Haida Gwaii in British Columbia southward along the coast to Southern California. Their eastward range is limited by the Coast Range in BC, and the Cascades in Washington and Oregon, except for a few isolated inland populations in the Columbia River watershed. This pattern continues into California where they flourish along the Coast Range but have only limited distribution in the Sierra foothills.

Still OK (center); too old (right)
Perfect stage (left)
The fertile shoots of Giant Horsetails are best picked between March 15th and April 15th. At this time they are 4-8” (5-10 cm) tall and the cones are still whitish. Before this time they are hard to see and too small to be worth the effort, and after this time they become stringy. Palatability plummets after the cones brown. Pluck shoots at ground level and carefully peel off the coarse bract that surrounds each node. These bracts are filled with silicates that will sand away at your teeth, an anti-herbivory adaptation that usually keeps the deer from eating them unless they are really hungry. Once you have peeled the shoots, discard the strobilus, rinse off any dirt, and enjoy them fresh. Their mild flavor and juiciness is similar to celery, but they lack the annoying fibers. I didn’t learn to eat Giant Horsetails until nine years ago when my friend Trent picked one at the Outback Farm ate it. They have been among my favorite wild shoot vegetables ever since.

Unprocessed vegetative shoots (left) and fertile shoots (right)
Perfectly ripe and peeled
The vegetative shoots of Giant Horsetail are also edible, but much more work for a product that is not as tasty. You must pick them before the needle like leaves have started to extend horizontally. Remove both the bracts (as above) and the leaves since the leaves contain the same silicate grazing defense as the bracts.

Closely related species often are used in very similar ways. Most Rubus fruits are choice edibles and most willows provide good withes for basket weaving. So too is the ethnobotany of horsetails. When I skimmed through Daniel Moerman’s “Native American Ethnobotany” I quickly realized that Indigenous societies across the continent traditionally use E. arvensis, E. telmateia, and E. hymenale for similar things such as skin poultices, tonics for internal organs and sandpaper. However, a few accounts such suggest that the very coarse stems of Scouring Rush (E. hymenale) where traditionally eaten as medicine, and I suspect that this is a case of mistaken identity on the part of the ethnobotanist. The plants all share similar habitat and appearance, making identification without a reference specimen challenging. 

The fertile shoots of Giant Horsetail are traditionally pealed and eaten by Indigenous groups from the Yurok in California to the Nuu-chah-nulth on the West Coast of Vancouver Island, and several in between (Moerman). Further north along the coast, the plant is less common; while it is still recognized, it is apparently not eaten (see Turner 2010; Turner and Bell 1973). The Makah (Gill 1983), Nitinaht, Nuu-chah-nulth (Turner et al. 1983; but see Turner and Efrat 1872), and Clallam (Gunther 1973) eat both the fertile and vegetative shoots. The Makah also eat the young strobilus after boiling it for 10 minutes, and have a special name for the reproductive shoots that reflects the “head” on the top (Gill 1983). In earlier times, the tubers were evidently collected later in the season and eaten raw by the Makah (Swan 1870), Cowlitz, and Swinomish (Gunther 1973), or boiled and served with grease by the Makah, Clallam, Quinault, Cowlitz, and Lower Chinook (Gunther 1973; Fleisher 1980). The early naturalist and ethnographer George Gibbs (1863) provides a name for horsetail roots in Clallam and Lummi. Gibbs (1877) also gives a name in Nisqually and Skykomish with the translation "ground grape (the tuber of a species of Equisetum)." The Cowlitz also pulverized the dried cones to mix with salmon eggs (Gunther 1973). The shoots are universally regarded as juicy and thirst quenching but I can find no descriptions of the taste of the tubers (and have not yet seen or tried them myself).
The name horsetail aptly reflects the similarity in appearance of the vegetative shoots to a horse’s tail. This resemblance is also captured in the genus name which means “horse bristle” in Latin. The species epithet comes from the Greek word telmat which means “wetland,” where the plants are often found. A geographically distinct subspecies of Giant Horsetail is found in Europe, Western Asia, and North Africa and retains the subspecies name telmateia whereas our western North American taxon goes by the subspecies name braunii (in honor of the German botanist Alexander Carl Heinrich Braun, 1805-1877, who specialized in spermophytes).

A week too late
Related species: Common Horsetail (Equisetum arvense)
Common Horsetails are widespread throughout North America. From a distance, they can be distinguished from Giant Horsetail by their smaller size, more kinked needles, and longer primary (inner most) leaf segments on each branch. In cross section, the needle like leaves are angled so strongly that they appear winged, and the void in the middle of the main stem is equal to or less than twice the wall thickness. The fastidious will also find that Giant Horsetails have 20-40 ridges around the stem while the Common variety have 10-15. At harvest time, the shoot thickness and wall to central void ratio are the most discernible differences. Fertile shoots of Common Horsetail can be peeled and eaten in the same manner as Giant Horsetail. They are more work for less reward, and I find them to also be less tasty. The young vegetative shoots may well be edible as above, but frankly, I can’t see how they would be worth the trouble when the fertile shoots are available.

E. telmateia x-section
E. arvense x-section
 The species epithet arvense comes from the Latin adjective “in the field,” an apt name for this common agricultural “weed.”

Fleisher, Mark 1980. The Ethnobotany of the Clallam Indians of Western Washington. Washington State University.
Gibbs, George 1863. Alphebetical vocabulary of the Clallam and Lummi.
Gibbs, George 1877. Tribes of Western Washington.
Gill, Steven 1983. Ethnobotany of the Makah and Ozette People, Olympic Peninsula, Washington. Washington State University, PhD. Thesis.
Gunther, Erna 1973. Ethnobotany of Western Washington. University of Washington Press, Seattle WA.
Moerman, Danielle. Native American Ethnobotany database. University of Michigan, Deerborn.
Swan, James 1880. The Indians of Cape Flattery, at the Entrance to the Straight of Fuca, Washington Territory. Smithsonian Contributions to Knowledge, Collins Printer, Philadelphia PA.
Turner, Nancy J. 2010. Plants of Haida Gwaii. Sononis Press, Winlaw BC.
Turner, Nancy J. and Barbara Efrat 1982. Ethnobotany of the Hesquiate Indians of Vancouver Island. Cultural Recovery Papers No. 2, British Columbia Provincial Museum.
Turner, Nancy J., John Thomas, Barry F. Carlson, and Robert T. Obilvie 1983. Ethnobotany of the Nitinaht Indians of Vancouver Island. Occasional Papers Series No. 24, British Columbia Provincial Museum.
Turner, Nancy J. and Marcus Bell 1973. Ethnobotany of the Southern Kwakiutl Indians. Economic Botany, Vol 2, No 3.

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  1. I just found your blog and am so happy to find a blog about foraging on this side of the country! Thank you very much for writing.

  2. Surely this is a site well worth seeing.

  3. Never knew horsetail was edible! It's a shame, I used to live where it grew all over!

  4. Hello T. Able Lloyd :) Thanks for the great post! I found some info on Equisetum spp. in the book Medicinal plants of the pacific west by Michael Moore that is pretty cool. It reads...Horsetail or Scouring Rush (Equisetum spp.) Wherever there is water, from Alaska to Baja California. Parts used Whole herb, dried. Preparation Standard Infusion, 2 to 4 fluid ounces, up to 5 times a day. Herb uses As a diuretic and kidney tonic; to strengthen the mesenchyme in the kidneys, lungs, and the liver. The tea is a good hair rinse. References Foster, Moore (Mountain), Schofield, Willard.

  5. Beautiful blog and wonderful info. I wonder if you would be amenable to adding the "follow by email" gadget? I would love to have your new posts delivered to my email inbox. Thanks for all your knowledge!

  6. hi Is the common field horsetail that's considered a weed in the prairies usable? What result is there from trying one if it IS the wrong variety? It's certainly horsetail, and I want to use it if possible ( it's starting to take over a field.) as I have read that the silica in it links to toxic heavy metals and helps get them out of the body, also that it's very good for restoring/maintaining healthy hair and nails. Any help is MUCH appreciated!

    1. Unknown, is there a place rhe author answered your questions? I'm in the middle of harvesting and drying and want to know the answers to your (or any of the other) questions. Thanks.

    2. Unknown, is there a place rhe author answered your questions? I'm in the middle of harvesting and drying and want to know the answers to your (or any of the other) questions. Thanks.

  7. The boy scouts many years ago back in the 60s were shown horsetails as a survival tool if you got lost in the woods. The shoots contain a small amount of water that you could drink. My father showed me the trick while fishing one of the many rivers surrounding Forks, WA. It does work in a pinch but i never knew you could eat them. Thank you for all the useful information

  8. This comment has been removed by the author.

  9. The Japanese look forward to horsetails as an early sign of spring and gather them to be eaten. https://www.facebook.com/photo.php?fbid=10209178430317629&set=pcb.10209178430917644&type=3&theater

  10. T. Abe Lloyd, thank you for your article. There are pictures of the edible horsetail, but the other types are not illustrated. Many "experts" have blogged about more than 2 which can be used for tea, tonics and cooking. Not sure who to believe. Could you share a trusted resource so l don't harvest and dry a harmful type? Thanks!

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