Foraging Horsetail for Food & Medicine

Eating Horsetail, Horsetail Medicine

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My first encounter with horsetail didn't impress me much. My mom-in-law pointed out the plant growing near a beach, explaining that native Indians used it to scrub with, much like we'd use a plastic bottlebrush today. The plant she pointed to was easy enough to recognize - a stalk with stiff "bristles" coming out on all sides. Certainly easy to recognize.

Years later, in one of my foraging books, I saw just how remarkable horsetail truly could be. First, I learned that what I'd seen growing near the beach was the non-fertile version of the plant (sometimes called "the female"). That's right, horsetail produces two distinctive-looking plants! What really impressed me was the fertile versions of the plant (sometimes called "the male"). It's not only prehistoric-looking, but phallic in shape. And, lo! Horsetail, I learned, is both edible and medicinal! Bonus: It's packed with good minerals and nurtients.

So when I found horsetail growing on our homestead last year, I was pretty excited. Because I didn't time things right, though, I didn't try eating it. This year, I made sure I was more on top of things, and last weekend, my family gave eating horsetail a try.

Horsetail's bulb-like rhizomes are edible. Courtesy Wikimedia Commons.
Identifying Horsetail

There are 20 species of horsetail that are native to North America and Europe. On our homestead, we have giant horsetail. (Other names for horsetail include field horsetail, scouring brush, bottlebrush, shave grass, corncob plant, scouring rush, field horsetail, pewterwort, paddock-pipes, Dutch rushes, and snake pipes. They are in the Equisetum family.)

All horsetail have jointed stems that break apart easily and burst with watery liquid. The plant generally prefers damp soil; I find it in boggy areas around the homestead.

Examining a horsetail patch.

Eating Horsetail Rhizomes

The rhizomes (a type of root) are edible - though I've not tried them yet. Before you can dig them up and eat them, you need to spot a patch of horsetail in the spring, when it sends up its strange shoots. Note the location, and next year, before horsetail begins shooting up, dig around the spent shoots to find the rhizomes. Peel them and add them to the stew pot, or peel and slice and add them to salads.

Eating Horsetail's Fertile Shoots
Fertile horsetail shoots.

In early spring, the nutrient-rich, fertile shoots appear, resembling asparagus. Color varies; with our giant horsetail, the fertile plant comes in tones of light and dark brown. These "males" are non-photosynthesizing and have a cone-like top with rows of spore-bearing dots. They grow up to 2 feet tall (some species grow taller), and should be harvested before their cone-tops turn dark.

To eat these shoots, simply cut them off at ground level, then peel off the dark brown stripes found along the joints of the plant. (These stripes are packed with silica, which is bad for your teeth and could cause irritation in the body.) Cut off the cone-like tops, too.

Traditionally, horsetail is usually eaten raw. I tried it this way and found it quite pleasant - very similar to celery in texture and mild taste. But because it tends to grow in boggy areas, my husband wondered if it was a risk due to e. coli. I've read a lot of foraging books and websites, and I've never seen this mentioned in regard to
Fertile shoots that are dark on top (right) aren't very good eating.
horsetail...but in order to play it extra safe, I went ahead and boiled the stalks for my family's consumption. This gave the plant a super-mild flavor (similar to cooked celery) and made it mushy, instead of crisp. You may also steam the shoots.

In the future, we will probably stick to eating the plant raw. (I eat a lot of raw wild foods, and I personally don't believe there is a greater risk of e. coli in horsetail than in the other wild foods I eat. However, I am not a physician, nor should I be considered an expert in this area.)
Dark stripes should be removed before eating.

Eating Horsetail's Non-Fertile Shoots
Mature non-fertile horsetail. Courtesy of

After the fertile shoots pop up, the female plant (which looks like a green bottle brush) appears. At first, it's spike-like leaves are tight to the plant, but gradually they expand out, giving the plant its distinctive look.

Although some foraging books say you shouldn't eat the non-fertile shoots, natives did, and so do many modern foragers, consuming them the same way they do the fertile shoots. However, the non-fertile shoots are much more work because you must peel them completely before consumption. (the outer layer is too full of silica to be safe to eat.) In addition, some sources claim non-fertile shoots must be "thoroughly boiled" before eating. Douglas Deur, in his book Pacific Northwest Foraging, notes that boiling with repeated changes to the water reduces any toxicity that might be found in the plant, due to chemicals in the soil.

Horsetail Medicine

Immature non-fertile shoots
Another way horsetail is unique is that it's one of the few plants with bio-available silica. Therefore, drinking horsetail tea can help repair damaged bones and connective tissue, while also encouraging strong hair and nails. The tea is also traditionally used to support the kidney, bladder, and prostate.

In addition, horsetail is diuretic, and herbalists sometimes use it to treat urinary tract infections, or to dissolve urinary stones. It's also said horsetail can curb excessive menstrual flow and internal bleeding and treat bronchitis, tuberculosis, and asthma.

An immature non-fertile shoot.
In addition to its high silica content, horsetail is full of calcium, sulfur, manganese, potassium, silicic acid, flavonoids, saponins, sterols, aluminum salts, and tannins.

There is a big HOWEVER when using horsetail as medicine. This plant should never be consumed regularly or for a long period of time because it can lead to thiamine deficiency.

When making horsetail medicine, always harvest non-fertile shoots before their leaves begin to droop. This helps prevent digestive upset. To dry the plant, hang whole stalks in a cool, dark location. It's important to avoid breathing in silica crystals that may appear as dust once the plant is dried; it is very irritating to the respiratory tract. To be extra cautious, wear a mask when placing dried horsetail in jars or creating herbal powders from the dried plant material.

Horsetail Tea

Pour boiling water over about 2 or 3 grams of chopped non-fertile horsetail stalk. Cover with a saucer and allow the tea to steep for 10 or 15 minutes. Remove the saucer and strain the tea through two layers of cheesecloth. Drink 4 oz. three times daily between meals.

Horsetail Tincture
More experience herbalists can turn fresh horsetail into a tincture (1:5). Consume 1 - 4 ml. three times daily.
Horsetail is made of segments, each containing mineral water.

Just as all prescription medicines have warnings, so do natural medicines.

Marsh horsetail (Equisetum palustre) is potentially toxic. (See also.)

Consuming horsetail for a long period of time may lead to a thiamine deficiency. Eating horsetail raw and in quantity may result in a depletion of B1. (Eating it cooked does not pose this risk.)

For some people, eating quantities of horsetail raw "may be mildly toxic" (Deur). Horsetail is toxic to livestock and perhaps to pets. When handling dried horsetail, it's wise to wear a mask to avoid the irritating dust it might produce.

As with all wild edibles, pay attention to where you harvest. Horsetail is especially good at absorbing heavy metals and chemicals in the soil. Also, it's possible to be allergic to any plant. Show wisdom by eating a small quantity to see if your body reacts negatively.

If horsetail is used with Benzodiazepines, Disulfiram, or Metronidazole, it may cause "a disulfiram-like reaction." (Source.) Taking horsetail along with medicines that deplete the body of potassium (like corticosteroids, diuretics, and laxative stimulants) increases the risk of developing dangerously low potassium. Do not use horsetail with licorice, since it may lead to low levels of potassium.

Do not take horsetail medicinally if you are pregnant or nursing, have heart problems, drink too much alcohol, or are prone to thiamine deficiencies.

Large quantities of the horsetail can be toxic because it contains thiaminase, which has the potential to deplete the body of B vitamins. In small quantities, this is not an issue. Cooking horsetail also eliminates this problem.

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  1. I had read a blog just last week on violets. I cannot find it now. can you help me?

  2. I haven't done an article on violets, so it must have been on a different blog :)