Welcome to our big horsetail product test 2021. Here we present all the products we have tested in detail. We have compiled detailed background information and added a summary of customer reviews on the web.
We would like to make your purchase decision easier and help you find the best horsetail product for you.
You will also find answers to frequently asked questions in our guide. If available, we also offer interesting test videos. Furthermore, you will also find some important information on this page that you should definitely pay attention to if you want to buy a horsetail product.
- 1 Weekly newsletter with the best personal finance tips
- 2 The most important facts
- 3 The Best Horsetail: Our Picks
- 4 Guide: Questions you should ask yourself before buying a horsetail product
- 4.1 What is horsetail?
- 4.2 What active ingredients does horsetail contain?
- 4.3 How does horsetail work - Are there side effects?
- 4.4 Horsetail as a medicine - When is it used?
- 4.5 When should I not use horsetail - Is horsetail poisonous?
- 4.6 Dosage forms - how to use horsetail
- 4.7 Where can I buy horsetail products?
- 4.8 How much do horsetail products cost?
- 4.9 Are there medicinal herb alternatives to horsetail?
- 5 Decision: What types of horsetail products are there and which one is right for you?
- 5.1 What makes horsetail tea special and what are its advantages and disadvantages?
- 5.2 What distinguishes horsetail tincture or juice and what are its advantages and disadvantages?
- 5.3 What distinguishes horsetail capsules/tablets and what are their advantages and disadvantages?
- 5.4 What distinguishes horsetail powder and what are its advantages and disadvantages?
- 5.5 What distinguishes horsetail globules and what are their advantages and disadvantages?
- 6 Buying criteria: You can use these factors to compare and evaluate horsetail products
- 7 Facts worth knowing about horsetail
The most important facts
- Horsetail belongs to the plant genus of ferns and has been growing on earth for about 357 million years. Of the approx. 15 - 32 species, only the field horsetail (tinweed) is non-toxic and has been used as a medicinal herb since ancient times.
- Field horsetail is a recognised medicinal herb, has a draining and cell-building effect. Among other things, it is used for: Kidney- bladder problems, poor metabolism / brittle hair and nails Circulatory disorders, joint problems and respiratory diseases.
- Horsetail is a relatively inexpensive herb and can be used internally and externally. You can buy it as: Tea, tincture, juice, capsule, powder or globules. For external use, you can easily make your own cream.
The Best Horsetail: Our Picks
Guide: Questions you should ask yourself before buying a horsetail product
What is horsetail?
However, it was already a valued medicinal herb in ancient times and was used to treat many different ailments.
All horsetail species have a bamboo-like style from which fine, green stalks (leaves) grow in a ring-shaped leaf sheath. The height of growth varies between 50 cm and a maximum of 2 metres.
Like ferns, horsetail does not form flowers. It reproduces through the air by spores and underground with rhizomes (runners) up to 2 m long.
To the chagrin of many gardeners and farmers, horsetail reproduces incredibly quickly and is almost impossible to get rid of once it has spread.
Horsetail is often referred to as a "living fossil". The reason for this is that the first horsetail plants were already found in the Devonian period, 357 million years ago. At that time, they had woody stems and grew to a height of up to 30 metres.
Today, around 15 - 32 different horsetail species are known, which mainly differ in size and composition of the active substances.
If you plan to grow or collect horsetail yourself, you should know which species is suitable. Because yes, there is also poisonous horsetail.
Known species of horsetail include:
- Field horsetail: up to 50 cm
- Marsh horsetail: up to 30 cm
- Winter horsetail: up to 100 cm
- Forest horsetail: up to 100 cm
- Pond horsetail: up to 150
- Japanese horsetail: up to 130 cm
Important to know are: Field horsetail (non-toxic) and Marsh horsetail (toxic). They differ mainly in site preferences and only slightly in appearance.
The other horsetail species mentioned are also poisonous. However, they are clearly different in appearance from field horsetail and confusion is thus rather rare.
Field horsetail (Equisetum arvense) - edible
Field horsetail is the only edible species and is used for medicinal purposes. It is also used as a fertiliser, pesticide or additive in cosmetic products.
Field horsetail is also known as: Horsetail, cat's-tail, horsetail, shank hay, frying pan weed, scouring weed. It grows, as the name suggests, in fields, fields and lawns. Its stems are over 3 mm thick.
Marsh horsetail (Equisetum palustre) - poisonous
Marsh horsetail or duwock contains the poisons palustrin and equisetim. It is poisonous to humans and animals.
The marsh horsetail prefers a moist, swampy soil and grows near water bodies or on terrain depressions in meadows, with a very high water table. The stems of marsh horsetail are thinner than 3 mm.
You can see further distinguishing features of the two horsetail species in the following video:
What active ingredients does horsetail contain?
- Silicic acid (silicon) (approx. 7.7 %)
- Aluminium chloride
- Potassium chloride
- Flavonoids (kaempferol / quercetin / luteolin)
- Caffeic acid derivatives (belong to the phenolic acid group of substances)
- Alkaloids (nicotine, 3-methoxypyridine palustrine)
- very few essential oils (approx. 0.01 %)
- Triterpenic acid
To help you understand where the effect of field horsetail comes from, we explain the ingredients that are mainly responsible for it: Silicic acid / potassium chloride / flavonoids.
The other substances also have a positive effect on the human organism, but are only present in small quantities in horsetail.
Silicic acid (silicon)
The high silicic acid content in the cell walls of horsetail is responsible for the flexible consistency of the stems. Silicic acid is a granular mineral with a high silicon content.
It is found almost everywhere in nature. E.g. in rocks, soil, plants and in water.
For humans and animals, silica is important for the structure and health of:
- Bones / teeth
- Tendons / ligaments
- Skin / hair / nails
- Connective tissue
Silica can also have a soothing effect on wound healing disorders, eczema, itching and sunburn. The silicon it contains is said to stimulate circulation and fluid balance.
The effect has not yet been proven by scientific studies.
However, numerous reports and the fact that deficiency symptoms can occur if there is too little silicon in the body suggest that taking it has a restorative and healing effect on the body.
Potassium is a colourless and odourless electrolyte that dissolves well in water. Potassium plays a central role in the healthy functioning of nerves and muscles.
A potassium deficiency can also play a role in cardiac arrhythmias and nervous diseases, among other things.
Potassium, together with other electrolytes, also controls the water balance. Oedema (water retention) or kidney complaints can also have to do with a potassium deficiency or excess.
Flavonoids are among the secondary plant substances and, with around 8000 different types, are a large group of substances with numerous positive healing effects.
They are found exclusively in the above-ground part of the plant and are mainly responsible for the formation of pigments.
Horsetail mainly contains kaempferol, quercetin and luteolin. They are said to have the following effect:
- Blood pressure lowering
- Fat reducing
- Tumour inhibiting / cancer preventing
How does horsetail work - Are there side effects?
To begin with, here is an overview of how horsetail affects the body:
- Diuretic / dehydrating
- Antioxidant (capturing and neutralising free radicals / toxins)
- Promotes circulation
- Metabolism stimulating
- Promotes hair and nail growth
- Strengthens connective tissue
- Promotes wound healing
- Tumour inhibiting (antiproliferative)
In the next chapter we will show you for which complaints a treatment with horsetail is promising.
Studies on the effect of horsetail
Horsetail is one of those natural remedies whose effect has been partially proven by scientific studies or laboratory tests.
Several studies have confirmed the diuretic and flushing effect of horsetail as well as its positive effect on incontinence and excessive urination.
The antioxidant, tumour-inhibiting effect has been confirmed in laboratory studies with human cells. Laboratory tests and studies with animals exist on the cell-building effect (bones, tendons, ligaments, etc.).
Other effects and areas of application are based on years of experience in medicine and can be understood from the ingredients contained.
There are also critical voices against the use of horsetail. Some experts are of the opinion that the positive effect in the treatment of bacterial infections with horsetail tea is only due to a higher drinking quantity during therapy.
Since horsetail has only a slight antibacterial effect, the number of bacteria can multiply unhindered during a treatment with too low a drinking quantity and thus the infection cannot be treated effectively.
Medical recognition of horsetail
Horsetail is classified as a medicinal product in Europe and has been positively evaluated and medically recognised by 3 authorities:
- Commission E: An independent scientific commission for herbal medicinal products of the Federal Institute for Drugs and Medical Devices (BfArM) in Germany.
- ESCOP: The umbrella organisation of national societies for phytotherapy (herbal medicine) English: European Scientific Cooperative on Phytotherapy, was founded in 1989 with the aim of creating standardised evaluation criteria for phytopharmaceuticals (herbal medicines) in Europe.
- HMPC: The "Committee on herbal Medicinal Products" belongs to the European Medicines Agency (EMA) as an expert committee and prepares extensive studies (monographs) for herbal medicinal products on a scientific basis.
Side effects of horsetail
So far, no side effects have been reported with the consumption of horsetail. However, people with impaired kidney and heart function should be careful.
The increased fluid consumption during treatment with horsetail tea, in combination with the diuretic and flushing effect, could overstrain the heart and kidneys.
Horsetail as a medicine - When is it used?
Consult a doctor to find out the cause of the symptoms and the appropriate treatment.
Field horsetail is used for many acute complaints and for their prevention. It is administered to children, adults and also animals.
The application can be divided into 4 areas of use:
Kidney, bladder, urinary tract complaints
- Swelling / water retention (oedema)
- Kidney pain, kidney stones
- Bladder problems, cystitis
- Kidney gravel
Poor metabolism / circulatory disorders
- Hair loss
- Brittle hair Nails
- Nail bed inflammation
- Skin problems: eczema / itching / dandruff / unclean skin
- Poor wound healing
- Weakness of connective tissue
Complaints in the musculoskeletal system
- Knee pain
- Joint pain
- Rheumatism / Arthrosis / Gout
- Cold / bronchitis / cough
- chronic cough
- Mucus in the lungs
For information on contraindications, scroll to the next chapter.
Horsetail in diseases of the urinary tract, kidneys and bladder
Horsetail is used for two types of diseases of the urinary tract, kidneys and bladder:
The diuretic and anti-inflammatory effect activates the kidney and liver functions and helps the body to flush out toxins.
This makes horsetail an important natural remedy for bladder and urinary tract infections, kidney diseases, oedema and poor metabolism.
The astringent and tissue-strengthening effect can provide relief from incontinence, bladder weakness and oedema.
Horsetail for poor metabolism or circulatory disorders
Symptoms of a poor, slow metabolism are manifold: brittle hair and nails, skin problems, oily skin, poor wound healing oedema, weak connective tissue, cellulite, weight gain.
Horsetail activates the metabolism, promotes blood circulation and helps the body build healthy tissue with its high silicic acid content.
Ideal for people who want to support their metabolism preventively in a natural way or suffer from symptoms of a poor metabolism.
For smaller wounds that heal poorly, external treatment with horsetail tea or tincture is recommended.
Horsetail for a healthy musculoskeletal system
Because of its combination of anti-inflammatory and cell-building effects, horsetail is prescribed for inflammatory joint pain or degenerative diseases. It promotes the development of strong muscles, tendons, ligaments and bones.
The circulation-promoting property supports the organism in fighting inflammation - chronic or recurring inflammatory conditions can be a consequence of poor circulation.
For the treatment of musculoskeletal complaints you can take horsetail or apply it externally.
Horsetail for athletes
The combination of substance-strengthening and electrolyte-balancing effects makes horsetail an ideal dietary supplement for athletes.
Regular consumption of horsetail helps to keep muscles (including the heart), tendons, ligaments and joints healthy, resilient and supple.
Horsetail for diseases of the respiratory tract and oral cavity
If you often have a cold or suffer from congested lungs or a cough, a treatment with tea is particularly recommended. It supports the elimination of mucus and soothes the respiratory tract.
Rinsing with horsetail can also have a soothing effect on inflammations of the mouth and throat, e.g. gingivitis or aphthae. In the case of serious illnesses such as tonsillitis, you should still consult a doctor in good time.
Horsetail for animals
Horsetail is also suitable for animals suffering from joint or muscle complaints. The easiest way to treat it is with a tincture or powder, which you mix into the food in the right dosage.
When should I not use horsetail - Is horsetail poisonous?
If you collect the herb in nature or plant it in your garden, find out how to recognise field horsetail or have the collected plants checked at a testing centre.
Apart from field horsetail, all varieties are poisonous to humans and animals. At the beginning of this guide you will find more information about the different types of horsetail.
A clear contraindication to horsetail is oedema caused by impaired kidney and heart function.
We are not aware of any studies on the need for caution during pregnancy or breastfeeding. Consultation with a specialist is strongly recommended.
Dosage forms - how to use horsetail
Horsetail for external use
Joint pain and skin problems are suitable indications for external use of horsetail. As no pure horsetail creams and shampoos are available for sale, we do not discuss these two products in detail.
Tea / tincture
With a strong tea (15 - 30 min brew) or a diluted tincture, you can treat healing wounds, eczema, rashes, dry skin or inflammation in muscles or joints.
- Soak a fine cloth with the liquid, wring it out and apply as a warm or cold compress
- A warm or cool partial bath for hands or feet
- Use the liquid to wash wounds. Caution: Do not treat festering or excessively moist wounds.
Creams / ointments with horsetail extracts
Creams containing horsetail extracts help with dry, cracked, sensitive, blemished skin or nail complaints. Known product manufacturers who offer creams with horsetail are:
- Dr. Hauschka
- Weleda Wild Rose skin care range
- Louise Widmer
Shampoo with horsetail extracts
In shampoos for dry, brittle and thin hair, horsetail is used for its cell-building and nourishing effect. You can find shampoos with horsetail from:
- Biokosma (hair oil / shampoo)
- Retterspitz Shampoo
- Sukin balnce Shampoo- sunkinnaturals.com
- Bioblas Olive Oil Shampoo
Horsetail to take
The classic for a horsetail treatment is tea. It is particularly suitable for kidney, bladder and urinary tract complaints, as the increased consumption of liquid has an additional flushing effect.
Of course, the tea also has a firming effect on the connective tissue, promotes blood circulation and has a cell-building effect for healthy joints and muscles. You can steep it for a good 5 - 15 minutes and vary the dosage as desired (½ to 3 cups/day).
Tincture / Juice
A slightly more expensive option is horsetail tincture or juice:
- In a tincture, the active ingredients of the plant are bound in the liquid over a longer period of time with the help of an extraction liquid (alcohol or glycerine). The drops are taken mixed with a little water.
- The juice is obtained by pressing the whole usable plant. The active ingredient concentration is lower, but it does not contain any extraction liquid and therefore certainly no alcohol. Per application, 10 - 20 ml of juice is taken with a glass of water.
Tincture and juice are suitable for any of the indications described, as a cure or permanent treatment. The dosage varies depending on the strength of the product and the age of the patient.
Capsules / tablets
Horsetail capsules or tablets have a neutral taste and are practical for on-the-go use. They contain either pressed horsetail powder or loose powder in a capsule shell made of cellulose.
They are generally a rather expensive option, especially if you want to take the product for a long time.
Loose horsetail powder can take some getting used to. It is best to mix it with food or a smoothie to neutralise the taste of the powder.
If it is processed in a high-quality way, it contains many active substances and no additives.
The homeopathic form of application of horsetail is globules. In homeopathy, they are mainly used for children. They have a very gentle effect - with precise dosage, long-lasting or permanent relief of complaints can be achieved.
Typical homeopathic indications for Equisetum arvense globules are: Bladder and urinary tract complaints / Bedwetting in children / Incontinence in adults
Where can I buy horsetail products?
You can order horsetail products online at these places:
How much do horsetail products cost?
The price range is widest for tinctures and capsules. The decisive factors for the price are the concentration of active ingredients, the manufacturing process and the purity of the product. A little research is worthwhile here. Even cheaper products are sometimes of excellent quality.
|Tea 100 - 200 g||3 - 13 euros|
|Tincture (concentrate) 100 ml||17 - 60 euros|
|Juice 200 ml (pressed plant)||10 - 20 Euro|
|Capsules / Tablets 60 pcs (400 - 500 mg powder/pc)||13 - 30 Euro|
|Powder 100 g||4 - 20 Euro|
|Globules 10 g||7 - 10 Euro|
Are there medicinal herb alternatives to horsetail?
For cell structure / good blood circulation / healthy water balance
If you are mainly interested in the effect of silicic acid , you can take pure silica. You can find it online and in any pharmacy or drugstore. Make sure that it is really high-quality silica from fossil algae.
Critical voices warn against consuming too much silica for too long. The high silicon content can damage the kidneys - if you are unsure how often and for how long you should take silica, consult a doctor.
If you don't like substituting with a preparation, integrate silicon-containing foods into your diet: Potatoes, millet, wheat, parsley, cauliflower, strawberries, spinach, grapes, peas, peppers and pears.
Here is a compilation of other herbal alternatives to horsetail:
|Kidney, bladder, urinary tract problems||stinging nettle / goldenrod / rose hip / birch leaves / cranberry juice|
|Poor metabolism||nettle / dandelion / ginger / chilli / green tea|
|Circulatory disorders||comfrey / chilli / eucalyptus / red vine leaves / rosemary / woodruff|
|Musculoskeletal disorders||rosehip / turmeric / devil's claw / sage / mustard / willow bark / arnica / calendula|
|Respiratory diseases||coltsfoot / camomile / thyme / sage / fir tip / ginger / liquorice|
Decision: What types of horsetail products are there and which one is right for you?
Horsetail products for medicinal use are available in 5 forms:
- Tincture / Juice
- Capsules / Tablets
Pure horsetail cream or shampoo is not commercially available. We show you how you can easily make a cream yourself under Trivia.
What makes horsetail tea special and what are its advantages and disadvantages?
Horsetail tea is the cheapest product and has been used since ancient times. You have the option of buying the tea loose or in a bag (e.g. from Sidroga).
Tea can be used internally and externally. Simply steep for 5-15 minutes and enjoy. You don't necessarily have to take tea as a medical treatment. Horsetail contains few bitter substances and is also suitable for consumption.
If you are often on the road or do not have the opportunity to prepare the tea fresh at work, a long-lasting or longer treatment is problematic.
What distinguishes horsetail tincture or juice and what are its advantages and disadvantages?
Stored in a cool place, juice and tincture have a long shelf life and are suitable for ingestion or diluted as a poultice or partial bath. For practical use on the go, pour some liquid into a small dropper bottle.
Due to the complex processing, the prices for juice and tincture are higher than for tea. Since juice is obtained by pressing the plant once and tincture by a longer extraction process, juice is much cheaper than a tincture.
On the other hand, the concentration of the active ingredient is smaller.
The bitter or alcoholic taste is certainly not to everyone's taste. On the other hand, it is easy and flexible to dose.
What distinguishes horsetail capsules/tablets and what are their advantages and disadvantages?
Capsules and tablets are about the same price as a tincture and are suitable for those who do not like the taste of horsetail. Tablets contain pure, pressed powder, in capsules the powder is enclosed in a vegetable cellulose shell.
Horsetail tablets are less suitable for children because of their size, and horsetail powder or tincture is also more recommended for animals.
What distinguishes horsetail powder and what are its advantages and disadvantages?
High-quality processed horsetail powder contains a high concentration of active ingredients and no additives. It is mainly taken mixed with food and can be dosed flexibly. You can also add it to pet food without any problems.
When mixed with food, the strong taste is hardly noticeable. If you have a sensitive stomach, too high a dose can cause flatulence, as the active ingredients are already distributed in the stomach and not in the intestines, as is the case with capsules.
What distinguishes horsetail globules and what are their advantages and disadvantages?
In homeopathy, horsetail is a tried and tested remedy for bladder and urinary tract infections, incontinence and bedwetting in children. The sweetish globules are also taken with pleasure by children and work effectively with the right dosage.
To adjust the potentisation (strength) and dosage to your needs, it is advisable to consult a homeopath.
Buying criteria: You can use these factors to compare and evaluate horsetail products
The most important criteria when buying horsetail preparations are:
- Dosage form / Dosage / Application
- Complementary medicine - Phytotherapy / TCM / Homeopathy
- Seal / Quality / Active ingredient Concentration
In the following, we explain to you what is important in these factors to help you make your purchase decision.
Form of administration / dosage / use
The following dosages are manufacturers' suggestions and do not replace the advice of a specialist. The dosage varies greatly depending on age, gender and the concentration of the active ingredient in the product.
Consultation with a doctor is recommended, especially in the case of severe, chronic complaints.
Ideally, you should take the product 2 - 3 times a day, 20 - 30 minutes before your next meal. In this way, the body can optimally absorb the active ingredients - of course, if you mix the powder directly into your food.
|Form of administration||Dosage||Use|
|Tea||½ to 3 cups/day||ingestion: steep for 5 - 15 min / externally steep for 15 - 30 min|
|Tincture||10 - 90 drops/day||intake: with a little water / externally: diluted|
|Juice||15 - 60 ml/day||intake with approx. 1 cup of water|
|Capsules / tablets||2 - 6 pcs/day||intake with approx. 1 cup of water|
|Powder||1 - 3 tsp powder/day||mixed with food|
|Globules||According to the dosage of a specialist||Absolutely with distance to meals|
Complementary medicine - Phytotherapy / TCM / Homeopathy
Horsetail has long been used medicinally in many cultures and traditions. If you do not want to dose the product yourself, you can seek advice in 3 complementary medicine areas.
Phytotherapy (herbal medicine)
Phytotherapy includes all forms of herbal treatment: E.g. tinctures, capsules, teas, baths, compresses, ointments, etc.. It is offered by alternative practitioners and also by an increasing number of orthodox doctors.
Traditional Chinese Medicine (TCM)
In TCM, mainly powders and teas with combinations of different herbs are used.
The exact composition is precisely adapted to your complaints by the doctor and, in the case of a longer treatment period, monitored and adjusted if necessary.
Herbal therapy is often accompanied by acupuncture, cupping or Tui Na massage. However, it can also be prescribed in isolation if desired.
Homeopathy has been considered an alternative medical treatment method since 1796. By administering minimal doses of a substance in the form of globules or tincture, the body is stimulated to heal itself.
Dosage and potentisation (strength of the remedy) is the key to successful homeopathic treatment and should be prescribed by a homeopathic professional.
Seal / Quality / Active ingredient concentration
The different dosage forms have common and individual quality requirements. For all products, look for an organic quality seal and the declaration: production without synthetic additives.
For tea, powder and capsules, gentle processing (drying and grinding) is also important. Otherwise, a large amount of active ingredients is lost. You can recognise poor-quality tea by the fact that a lot of powder collects at the bottom of the package.
If the product is wild-collected
, the concentration of active ingredients is usually very high.
For a tincture, the production ratio plays an essential role. Common ratios are 1:1 / 1:3 / 1:5. The smaller the ratio, the higher the active ingredient concentration and usually the more expensive the product.
Natural remedies are usually produced vegan. If you attach importance to this label and cannot find it in the product description, ask the manufacturer directly.
Facts worth knowing about horsetail
Would you like to know more about horsetail? In our trivia section we have compiled interesting information about this special medicinal plant for you.
How do I make horsetail lotion?
- Approx. 1 tbsp. dried field horsetail (if you use fresh herb, you need approx. a handful)
- Approx. 100 ml water
- 100 ml oil - depending on preference: almond oil / jojoba oil / sesame oil / etc.
- 12 g beeswax
- optional 15 drops of horsetail tincture / concentrate
- Coffee filter
- Pan for a water bath
- Empty screw-top glass or jar for storage
- Whisk, blender or milk frother
- Put horsetail in a pot, cover with water and soak for 24 hrs.
- Bring the mixture to the boil and leave to infuse for 15 minutes at a low temperature.
- Strain the extract through a coffee filter.
- Melt the oil & wax in a separate vessel in a water bath. Caution: No water should get into the mixture.
- Bring 70 - 80 ml of the horsetail extract to the same temperature as the wax-oil mixture.
- Pour the water extract into the oil-wax mixture while stirring continuously. (Similar to making mayonnaise)
- Add horsetail tincture (optional)
- Pour lotion into a screw-top jar or jar & allow to cool.
- Label the jar and store in a cool place.
Horsetail in the garden - What pests does horsetail help against?
With a horsetail broth, also called liquid manure, you can fight fungi and pests in the garden and fertilise your plants. Horsetail fights:
- Fungal diseases: Powdery mildew / Rose rust
Such a slurry is very easy to make. You can see how in the video:
How do I plant horsetail?
Planting horsetail is not particularly difficult. However, most garden lovers have trouble getting rid of the herb.
If you intend to plant a specific horsetail variety, experts advise you to set up a growth barrier - analogous to a bamboo barrier. The spore maturity of horsetail is from March to June. This is also the ideal time to sow it.
How do I get rid of horsetail?
Once it has moved into the garden, the fight against the stubborn horsetail is nerve-wracking. Fighting it with poison is only marginally promising, as it spreads via underground runners (rizomes) up to 2 m long.
This means you have to get to the root of the problem and remove the plant including the rizomes. Horsetail prefers compacted, moist soils.
To prevent horsetail from spreading, digging up and loosening the soil in spring helps.
Image source: pixabay.com / Julia Schwab