Nettle

Urtica dioica

Common & Folk Names

• Stinging Nettle
• Common Nettle
• Greater Nettle
• Devil’s Leaf
• Burn Hazel
• Burn Weed
• Wild Spinach
• Burn Nettle

Plant Family

Urticaceae (Nettle family)

Geographic Location

Native to Europe, Asia, northwestern Africa, and western North America. Now naturalised in temperate regions worldwide including Australia and New Zealand. Thrives in areas up to 1800 m altitude. In Aotearoa/New Zealand, nettle is naturalised and found throughout both islands, particularly in disturbed areas, riverbanks, and around old homesteads.

Habitat

Nettle thrives in nutrient-rich, moist soils with high nitrogen content, often found in disturbed areas, along riverbanks, forest edges, near old farmsteads, in hedgerows, and around compost heaps. Prefers partial shade but tolerates full sun with adequate moisture. Its presence often indicates fertile, nitrogen-rich soil.

Growing Conditions

Sun: Prefers partial shade but can grow in full sun with consistent moisture

Soil: Requires rich, moist, fertile loamy soil with good nitrogen content; pH 5.5-7.5 (neutral to slightly acidic preferred). Tolerates a wide range of soil types if adequately fertile

Propagation: Easily grown from seed sown in autumn or spring (stratify seeds for 4-6 weeks for best germination), or by root division in early spring or autumn. Spreads aggressively via creeping rhizomes

Care: Requires consistent moisture, especially during active growth. Wearing gloves is essential when handling fresh plants due to stinging hairs containing formic acid and histamine. Cutting back before flowering helps control spread and encourages tender new growth. Can become invasive; contain with barriers or grow in designated areas

NZ Planting Calendar

Propagation (division): Autumn (March–May) or spring (September–November) – divide established clumps

Propagation (seed): Spring (September–November) – surface sow, requires light

Planting: Autumn (March–May) or spring (September–November)

Growth: Perennial; dies back in winter, re-emerges in spring

Harvest (leaves): Spring to early summer (September–December) before flowering for best nutritional content; can harvest year-round but quality declines after flowering

Flowering: December–February (summer)

Harvesting Guidelines

For medicinal use, the aerial parts (leaves and stems) are harvested in spring and early summer before flowering, when nutrient, chlorophyll, and mineral content are highest. Young shoots in the top 10-15 cm are most tender and nutritious. Harvest on a dry day in the morning after dew has evaporated. Roots are harvested in autumn after the aerial parts have died back, when root constituents are most concentrated. Always harvest with thick gloves or use scissors to avoid stings. Dry quickly at low temperatures (below 40°C) to preserve color, nutrients, and volatile compounds. For nutritive infusions, fresh or properly dried leaves are preferred.

Parts Used

• Leaves (aerial parts) – primarily for nutritive and anti-inflammatory uses
• Stems – used with leaves
• Roots – specifically for prostate support (BPH)
• Seeds – traditionally for kidney and adrenal support

Constituents & their Actions

Nettle is exceptionally rich in bioavailable minerals, vitamins, and diverse bioactive compounds that work synergistically to produce its wide-ranging nutritive and therapeutic effects.

Flavonoids and Polyphenolic Compounds:

These polyphenolic compounds are potent antioxidants and modulators of inflammatory pathways, contributing significantly to nettle’s anti-inflammatory and antihistamine properties. The main flavonoids in nettle are:

• Quercetin and quercetin-3-O-glucoside
• Kaempferol and kaempferol-3-O-glucoside
• Rutin (quercetin-3-O-rutinoside)
• Isorhamnetin and isorhamnetin-3-O-glucoside
• Isorhamnetin-3-O-rutinoside

The main actions of these flavonoids are:

• Anti-inflammatory: Inhibit production of pro-inflammatory mediators including prostaglandins, leukotrienes, and cytokines
• Antioxidant: Scavenge free radicals and prevent oxidative damage to cells
• Antihistamine: Stabilise mast cells and inhibit histamine release, providing relief from allergic symptoms
• Vascular support: Strengthen capillary walls and support healthy circulation
• Enzyme inhibition: Modulate cyclooxygenase (COX) and lipoxygenase (LOX) inflammatory pathways

Phenolic Acids:

Nettle contains substantial amounts of phenolic acids that contribute to its antioxidant and anti-inflammatory activities. Major phenolic acids include:

• Caffeic acid
• Caffeoylmalic acid (CMA)
• 3-Caffeoylquinic acid (3-CQA, chlorogenic acid)
• Ferulic acid
• Chlorogenic acid
• Caffeoyltartaric acid

The main actions of these phenolic acids are:

• Antioxidant activity: Neutralise free radicals and reduce oxidative stress
• Anti-inflammatory: Support healthy inflammatory responses
• Metabolic support: Influence glucose and lipid metabolism

Lignans and Phenylpropanes (Root):

These compounds, particularly concentrated in nettle root, are key to the root’s activity on prostate tissue and hormonal pathways. The main lignans are:

• (-)-3,4-Divanillyltetrahydrofuran
• Secoisolariciresinol
• Isolariciresinol
• Pinoresinol
• Neoolivil
• Dehydrodiconiferyl alcohol

The main actions of these lignans are:

• 5-Alpha-reductase inhibition: Reduce conversion of testosterone to dihydrotestosterone (DHT), helping to manage benign prostatic hyperplasia
• SHBG binding: Inhibit sex hormone-binding globulin (SHBG) interaction with prostatic tissue
• Anti-inflammatory: Modulate inflammatory responses in prostate tissue
• Antioxidant: Protect tissues from oxidative damage

Polysaccharides (Root):

Complex carbohydrate structures found primarily in nettle root that contribute to immune modulation and anti-inflammatory effects. Main types include:

• Glycans
• Glucogalacturonans
• Arabinogalactan

The main actions of these polysaccharides are:

• Immunomodulation: Influence immune cell activity and cytokine production
• Anti-inflammatory: Block binding of epidermal growth factor (EGF) in prostate tissue, reducing cellular proliferation
• Tissue protection: Support healthy tissue function

Lectins (Urtica dioica Agglutinin – UDA):

A unique single-chain polypeptide of 89 amino acids rich in glycines, cysteines, and tryptophans, found primarily in nettle root. UDA is remarkably stable and heat-resistant.

The main actions of nettle lectins are:

• Immunomodulation: Act as T cell superantigens, selectively activating specific immune cells
• Antiproliferative: Block binding between epidermal growth factor and its receptors on prostate cells, inhibiting abnormal cell growth
• Antimicrobial: Demonstrate activity against certain viruses including HIV, influenza, and cytomegalovirus

Mineral Salts (Exceptionally High):

Nettle leaves are among the most mineral-rich edible plants, with exceptionally high levels of bioavailable minerals. Minerals account for approximately 20% of dry mass. Main minerals include:

• Iron: 1.6-180 mg/kg (significantly higher than spinach at 0.8 mg/100g fresh)
• Calcium: 325-5540 mg/100g (extraordinarily high, especially in hydroponically grown plants)
• Potassium: High levels
• Magnesium: Abundant
• Silica (silicon): Very high levels, important for connective tissue
• Phosphorus: Good levels
• Zinc, Copper, Manganese: Present in significant, bioavailable amounts

The main actions of these mineral salts are:

• Nutritive tonic: Provide essential building blocks for blood formation, bone health, and tissue repair
• Hematinic: Support red blood cell production and oxygen transport (iron)
• Bone and tooth health: Calcium and phosphorus support skeletal integrity
• Connective tissue support: Silica supports collagen formation and tissue elasticity
• Electrolyte balance: Potassium and magnesium support proper cellular function

Vitamins:

Nettle is extraordinarily rich in vitamins, making it a complete nutritive tonic. Main vitamins include:

• Vitamin A (including β-carotene): Can supply 90-100% of daily needs per serving
• Vitamin C: 60-100 mg/100g fresh leaf (high levels for a green vegetable)
• Vitamin K: Very high levels (important for blood clotting)
• B-Complex vitamins: Thiamine (B1), riboflavin (B2), pyridoxine (B6), folic acid (B9), niacin (B3)
• Vitamin E: Present in significant amounts

The main actions of these vitamins are:

• Antioxidant: Vitamins C, E, and carotenoids protect against oxidative damage
• Blood formation: B vitamins and vitamin K support healthy blood production and clotting
• Immune support: Vitamin C and vitamin A enhance immune function
• Vision and skin health: Vitamin A supports healthy mucous membranes and vision

Chlorophyll:

Nettle contains very high levels of chlorophyll, particularly in spring-harvested leaves, giving it a rich green color and contributing to its blood-building properties.

The main action of chlorophyll is:

• Blood building: Structurally similar to hemoglobin; supports healthy red blood cell formation

Proteins and Amino Acids:

Nettle contains approximately 30% protein on a dry weight basis, with a complete profile of essential amino acids making it an exceptional protein source for a leafy vegetable.

The main actions are:

• Nutritive: Provide essential amino acids for tissue building and repair
• Muscle and tissue support: Complete protein profile supports overall nutrition

Acetylcholine, Histamine, Serotonin, and Formic Acid (Stinging Hairs):

These compounds are contained in the hollow stinging hairs (trichomes) that act like hypodermic needles when touched. Typical concentrations in the stinging fluid:

• Formic acid and leukotrienes (primary irritants)
• Histamine: 1 in 500 to 1 in 2000 concentration
• Acetylcholine: approximately 1%
• Serotonin (5-hydroxytryptamine)

The main actions of these compounds in stinging hairs are:

• Rubefacient/Counter-irritant (topical, fresh plant): Increase local blood flow when applied to skin, traditionally used for arthritis relief
• Immediate inflammatory response: Cause characteristic urticaria (stinging, redness, welts) upon contact

Actions with Mechanisms

Nutritive Tonic (Highly Mineralising):
Nettle’s exceptional concentration of bioavailable minerals–particularly iron, calcium, silica, potassium, and magnesium–along with complete proteins, vitamins, and chlorophyll provides essential building blocks that the body requires for blood formation, bone health, and tissue repair, which in turn supports recovery from anemia, fatigue, mineral deficiency, convalescence, and general debility. The mineral salts are chelated to organic compounds in the plant, which in turn enhances their absorption and bioavailability compared to isolated mineral supplements. The high chlorophyll content, structurally similar to hemoglobin, further supports blood building, which in turn makes nettle one of the premier nutritive tonics in herbal medicine, especially valuable during pregnancy, lactation, growth periods, and recovery from illness.

Anti-inflammatory (Systemic and Local):
The flavonoids, particularly quercetin and kaempferol, along with phenolic acids in nettle inhibit key inflammatory enzymes including cyclooxygenase-2 (COX-2) and 5-lipoxygenase (5-LOX), which in turn reduces the production of pro-inflammatory prostaglandins and leukotrienes. Additionally, nettle compounds suppress the transcription factor NF-κB (nuclear factor kappa B), a master regulator of inflammatory gene expression, which in turn prevents the production of pro-inflammatory cytokines such as interleukin-1β (IL-1β) and tumor necrosis factor-alpha (TNF-α). These combined mechanisms provide dual-pathway inhibition of inflammation, which in turn makes nettle valuable for chronic inflammatory conditions including arthritis, allergic inflammation, and autoimmune conditions. The anti-inflammatory effects extend to both systemic and localised inflammation.

Antihistamine and Anti-Allergic:
Nettle’s flavonoids, particularly quercetin, stabilise mast cell membranes, which in turn prevents degranulation and subsequent release of histamine and other inflammatory mediators into surrounding tissues. The plant also directly inhibits histamine H1 receptors (though less potently than pharmaceutical antihistamines), which in turn reduces the cellular response to histamine that has already been released. Additionally, nettle inhibits tryptase, a protease enzyme released by mast cells that amplifies allergic responses, which in turn further dampens the allergic cascade. These multiple mechanisms working together provide relief from seasonal allergic rhinitis (hay fever), allergic conjunctivitis, urticaria, and other histamine-mediated conditions without the sedating effects of many conventional antihistamines.

Diuretic (Gentle, Aquaretic):
The high potassium salt content combined with flavonoids and organic acids in nettle promotes increased kidney filtration and urine production without causing significant electrolyte loss, which in turn helps the body flush metabolic wastes, uric acid, and excess fluid. This diuretic action is described as “aquaretic” because it primarily increases water excretion rather than forcing elimination of electrolytes, which in turn makes it safer for long-term use compared to pharmaceutical diuretics. The gentle diuretic effect supports the urinary system in conditions of mild fluid retention, aids in flushing bacteria from the urinary tract, and helps eliminate metabolic wastes, which in turn makes nettle valuable as a spring cleansing tonic and for supporting kidney function.

5-Alpha-Reductase Inhibition (Root – BPH Support):
The lignans in nettle root, particularly (-)-3,4-divanillyltetrahydrofuran, inhibit the enzyme 5-alpha-reductase which converts testosterone to the more potent dihydrotestosterone (DHT) in prostate tissue, which in turn reduces the hormonal stimulus for prostate cell proliferation in benign prostatic hyperplasia (BPH). Additionally, nettle root compounds inhibit the binding of sex hormone-binding globulin (SHBG) to its receptors on prostatic cell membranes, which in turn interferes with the cellular uptake of testosterone and further reduces androgenic stimulation of the prostate. The polysaccharides and lectins in the root block the binding between epidermal growth factor (EGF) and its receptors on prostate cells, which in turn suppresses cell metabolism and growth independent of hormonal pathways. These multiple mechanisms working together reduce urinary frequency, improve urinary flow, and decrease nighttime urination in early-stage BPH.

Hemostatic (Mild Astringent):
The tannin content in nettle, while relatively modest compared to classic astringent herbs, provides a mild tightening and tonifying effect on tissues and blood vessels, which in turn reduces minor bleeding and excessive secretions. This astringent action on blood vessels helps control minor hemorrhages including nosebleeds, excessive menstrual bleeding (when appropriate), and bleeding hemorrhoids, which in turn makes nettle valuable as a gentle hemostatic agent. The vitamin K content further supports proper blood clotting mechanisms, which in turn enhances the plant’s traditional use for bleeding disorders.

Immunomodulatory:
The lectins (UDA) in nettle act as superantigens that selectively stimulate specific populations of T lymphocytes, which in turn influences immune cell populations and immune responses in complex ways. The polysaccharides enhance phagocytic activity of macrophages and influence cytokine production, which in turn modulates both innate and adaptive immune responses. However, nettle’s immunomodulatory effects appear to be regulatory rather than simply stimulating or suppressing, which in turn helps restore balance to dysfunctional immune responses in conditions like allergies and possibly autoimmune conditions, though more research is needed in this area.

Hypoglycemic (Mild Blood Sugar Support):
Components in nettle including specific flavonoids and lectins influence insulin secretion from pancreatic islet cells and may improve insulin sensitivity in peripheral tissues, which in turn helps support healthy blood glucose regulation. Research suggests nettle may inhibit intestinal enzymes involved in carbohydrate digestion, which in turn reduces the rate of glucose absorption from the digestive tract. These mechanisms provide mild support for blood sugar management, which in turn makes nettle a useful adjunct in metabolic syndrome and type 2 diabetes management, though it should complement rather than replace standard medical treatment.

Antirheumatic (Urtication – Counter-irritant):
When fresh nettle leaves are deliberately applied to arthritic joints in the traditional practice of “urtication,” the histamine, acetylcholine, serotonin, and formic acid released from the stinging hairs create intense local inflammation and increased blood flow to the affected area, which in turn stimulates endogenous anti-inflammatory and analgesic responses through neurological pathways. This counter-irritation effect activates both local and systemic pain-modulating mechanisms, which in turn provides relief from chronic joint pain and stiffness. Additionally, the temporary inflammation may stimulate healing responses in chronically inflamed tissues, which in turn explains the paradoxical use of an irritating plant to treat inflammation.

Main Use

Nettle’s primary applications center on its exceptional nutritive properties and anti-inflammatory actions, making it one of the most valued tonic herbs in Western herbal medicine.

Internally, nettle leaf serves as a premier nutritive tonic and restorative, particularly valuable for iron-deficiency anemia, mineral depletion, fatigue, convalescence, and as a pregnancy and lactation tonic (under professional guidance). The high bioavailable iron, calcium, and complete mineral profile make it superior to isolated supplements for long-term mineral restoration. Nettle is a cornerstone herb for seasonal allergic rhinitis (hay fever), allergic conjunctivitis, and other histamine-mediated allergic responses, used both preventatively and acutely. Its anti-inflammatory properties make it valuable for arthritis (especially inflammatory types like rheumatoid arthritis), gout, and other chronic inflammatory conditions. The gentle diuretic action supports urinary tract health, aids in flushing mild urinary tract infections, and helps with fluid retention and elimination of metabolic wastes, making it a traditional spring tonic for “blood cleansing.”

Nettle root has specific application for symptomatic relief in early-stage benign prostatic hyperplasia (BPH), reducing urinary frequency, improving urinary flow, and decreasing nocturia (nighttime urination). It is often combined with saw palmetto (Serenoa repens) for enhanced efficacy. Root preparations do not reduce prostate size but improve urinary symptoms and quality of life.

Nettle seed is traditionally used as a kidney tonic and for adrenal support, though clinical research on seeds is limited compared to leaf and root.

Topically, fresh nettle applied directly to the skin through urtication (intentional stinging) is a traditional folk remedy for arthritic joints, providing counter-irritant effects and pain relief. Infusions or diluted tinctures can be used as hair rinses to support scalp health, reduce dandruff, and potentially stimulate hair growth.

Preparations

Tea/Infusion (Leaf): Standard infusion: steep 1-3 teaspoons (2-4 grams) of dried leaf in 250 mL boiling water, covered, for 10-15 minutes. For nutritive mineral infusion: use 30-60 grams of dried leaf in 1 liter of water, steep for 4-8 hours or overnight (covered), strain, and drink throughout the day. This long infusion maximises mineral extraction, producing a dark, rich brew with superior nutritive properties

Tincture (Leaf, Fresh or Dried): Fresh plant tincture 1:2 in 40-50% alcohol, or dried plant tincture 1:5 in 25-40% alcohol. Alcohol concentration can be lower because many of nettle’s constituents are water-soluble

Tincture (Root): Use dried root at 1:5 ratio in 40-50% alcohol to extract lignans and other active compounds

Freeze-Dried Leaf (Capsules): Freeze-drying preserves the plant’s nutrients and has been used in clinical trials for allergic rhinitis. Commercial preparations typically standardise to specific flavonoid or silica content

Fresh Juice: Young spring leaves can be juiced (wear gloves during processing; stinging compounds are destroyed by blending). Dilute with water or other juices. Consume immediately or freeze in ice cube trays for later use

Cooked Greens: Young spring leaves (top 10-15 cm) can be steamed, sautéed, or added to soups. Cooking for 1-2 minutes completely destroys stinging compounds, making nettle safe and delicious. Use as you would spinach or other cooked greens

Infused Vinegar: Excellent mineral extraction method. Pack dried nettle leaves in a jar, cover completely with apple cider vinegar, infuse for 4-6 weeks, shaking regularly. Strain and use 1-2 tablespoons in water or on salads for highly bioavailable minerals

Nourishing Infusion Blend: Combine nettle with other nutritive herbs like oat straw, red clover, and alfalfa for a comprehensive mineral tonic

Dosage

Dried Herb (Standard Tea): 2-4 grams (approximately 1-3 teaspoons) of dried leaf, 3 times daily as tea

Dried Herb (Nourishing Infusion): 30-60 grams of dried leaf in 1 liter of water, steeped 4-8 hours, consumed throughout the day for maximum nutritive benefit

Tincture (Leaf, 1:5 in 25% alcohol): 2-5 mL, 3 times daily

Tincture (Fresh Leaf, 1:2 in 50% alcohol): 2-4 mL, 3 times daily

Tincture (Root, 1:5 in 45% alcohol): 2-4 mL, 2-3 times daily for BPH support

Freeze-Dried Leaf (Capsules): 300-600 mg, 2-3 times daily (clinical trials for allergic rhinitis used 300 mg twice daily)

Fresh Cooked Greens: 50-100 grams of fresh young leaves, cooked and consumed as food, provides excellent nutrition

Fresh Juice: 5-15 mL of fresh juice, diluted in water, 1-3 times daily

Duration: For nutritive support and chronic conditions, nettle is safe for long-term use (months to years). For acute allergies, may be used throughout allergy season. For BPH, root preparations typically require 4-6 weeks of consistent use to see benefits, with continued use as needed.

Safety & Drug Interactions

Scientific Evidence

Benign Prostatic Hyperplasia (BPH): Multiple human clinical trials have demonstrated that nettle root extract significantly improves urinary flow parameters, reduces post-void residual urine volume, decreases nocturnal urination frequency, and enhances quality of life in men with early-stage BPH. A placebo-controlled, double-blind, multicenter trial (Lopatkin et al., 2005) found that long-term treatment with a combination of saw palmetto and nettle root extract was safe and effective for managing BPH symptoms, with improvements maintained over 18 months. The combination therapy showed superior results to either herb alone, suggesting synergistic mechanisms. Nettle root does not reduce prostate size but effectively manages symptoms.

Allergic Rhinitis (Hay Fever): A randomised, double-blind study (Mittman, 1990) using freeze-dried nettle leaf (300 mg twice daily) in patients with allergic rhinitis found that 57% of patients rated nettle as moderately to highly effective in relieving allergy symptoms after one week of treatment, significantly more than placebo. The study confirmed nettle’s antihistamine and mast cell-stabilising properties translate to clinical benefit. Nettle is now widely recommended by herbalists and some physicians as a first-line treatment for seasonal allergies, often used preventatively starting 2-4 weeks before allergy season.

Anti-inflammatory Mechanisms: In vitro research (Riehemann et al., 1999) demonstrated that nettle plant extracts potently inhibit the pro-inflammatory transcription factor NF-κB, which regulates the expression of numerous inflammatory mediators including cytokines, chemokines, and adhesion molecules. This provides molecular-level evidence for nettle’s traditional use in inflammatory conditions. Additional studies have confirmed inhibition of COX and LOX enzymes, supporting multi-pathway anti-inflammatory action that may benefit arthritis, inflammatory bowel conditions, and other chronic inflammatory states.

Nutritional Analysis and Bioavailability: Laboratory analyses consistently confirm exceptionally high levels of bioavailable minerals in nettle leaf, particularly iron, calcium, silica, and magnesium. Studies (Rutto et al., 2013) show that processed nettle can supply 90-100% of daily vitamin A requirements and provides excellent dietary calcium, iron, and protein. A 100-gram serving provides significant portions of daily mineral needs. Hydroponically grown nettle can contain up to 5.54% calcium and 180.67 mg/kg iron (dry weight). The organic chelation of minerals in the plant matrix enhances absorption compared to isolated mineral supplements, validating nettle’s traditional use as a superior nutritive tonic.

Antirheumatic Effects (Urtication): A randomised controlled trial (Randall et al., 2000) investigated nettle sting (urtication) treatment for base-of-thumb pain (osteoarthritis). Patients who self-administered nettle sting daily experienced significant pain reduction compared to placebo, with no serious adverse effects. This validates the traditional folk practice of deliberately stinging arthritic joints with fresh nettle for pain relief. The mechanism likely involves counter-irritation, localised immune modulation, and neurological pain pathway activation.

Hypoglycemic and Metabolic Effects: Animal studies and preliminary human research suggest nettle may help regulate blood glucose levels and improve lipid profiles. Studies have shown effects on insulin secretion, glucose absorption, and lipid metabolism, supporting traditional use in diabetes and metabolic syndrome, though more robust human trials are needed.

Western Energetics

Temperature: Drying and Slightly Cooling. Nettle’s diuretic action and ability to reduce inflammation indicate a cooling quality that clears excess heat from the body. However, it is not as intensely cooling as some herbs, and its warming mineral-building properties balance this. The fresh plant’s stinging action is warming/stimulating when applied topically.

Moisture: Drying (Aquaretic). Nettle’s strong diuretic action and mild astringent properties indicate a drying quality that helps resolve “damp” conditions such as edema, fluid retention, lymphatic congestion, boggy tissues, and damp-type arthritis with swelling. However, it also nourishes and moistens on a deeper constitutional level through its rich mineral content, addressing the dryness of depletion and deficiency.

Tissue State: Nettle is indicated for multiple tissue states:

Atonic/Deficient: As a nutritive tonic, nettle excels at building and strengthening depleted, weak, undernourished tissues, restoring tone to systems that have become deficient

Damp/Stagnant: The diuretic and alterative actions clear fluid retention, congestion, and stagnation, moving stuck fluids and metabolic wastes

Hot/Excitable: The anti-inflammatory and antihistamine actions cool and calm overactive, inflamed, hypersensitive tissues as seen in allergies and acute inflammation

Nettle’s versatility across tissue states makes it valuable in complex conditions that combine deficiency with inflammation or stagnation

Taste

Salty (Mineral Taste): The dominant taste when drinking nettle tea is a distinct salty, mineral quality that directly reflects the extraordinarily high concentration of mineral salts in the plant. This salty taste indicates nettle’s affinity for building blood, nourishing tissues, and restoring depleted mineral reserves. In traditional medicine, the salty taste corresponds to nutritive, tonic, and blood-building actions, all of which are primary qualities of nettle.

Earthy/Green/Chlorophyll-Rich: A pronounced “green” vegetable taste reminiscent of spinach or other dark leafy greens, suggesting nettle’s rich chlorophyll content and blood-building properties. This earthy quality connects to nettle’s alterative (cleansing) and detoxifying effects, its ability to “green” and revitalise the blood. The taste of vitality and spring growth.

Slightly Bitter: A mild but perceptible bitter undertone contributes to nettle’s digestive-stimulating and alterative (blood-cleansing) effects. The bitter quality supports liver function, aids detoxification, and enhances digestive secretions. This bitterness is gentle enough not to dominate but sufficient to indicate nettle’s role in spring cleansing and elimination of metabolic wastes.

Slightly Sweet (Nutritive): When prepared as a nourishing infusion (long steeping), nettle develops a subtle sweet quality that reflects its deeply nutritive properties and rich carbohydrate content from polysaccharides. This sweet aspect speaks to nettle’s tonic, strengthening, and tissue-building actions.

Plant Lore

Nettle has an extraordinarily rich history in European folk medicine, food traditions, and cultural practices spanning thousands of years. The plant’s name “nettle” derives from the Anglo-Saxon word “noedl” (needle), referencing the sharp, stinging sensation from its hollow hairs.

In ancient times, nettle was considered one of the nine sacred herbs in the Anglo-Saxon “Nine Herbs Charm,” a medieval medical text, where it was valued for its protective and healing properties. The Romans brought nettle to Britain, and Roman soldiers reportedly rubbed their limbs with nettle to keep warm in the cold northern climate–the stinging action increases circulation and creates a sensation of heat.

Nettle has long been known as the ultimate “spring tonic” in European herbalism. After a winter of heavy foods and limited fresh vegetables, people would eagerly gather young nettle shoots as one of the first green foods of spring, consuming them to “cleanse the blood,” restore vitality, and eliminate accumulated metabolic wastes. This practice of spring nettle consumption continues in many rural communities across Europe.

In Norse mythology, nettle was sacred to Thor, the god of thunder, and was thought to provide protection from lightning and dark magic. European folklore held that carrying nettle would ward off ghosts, evil spirits, and negative energies, and that planting nettle near a house would protect the dwelling. Nettle was also believed to break curses and hexes.

The practice of “urtication”–deliberately stinging arthritic joints with fresh nettle–is an ancient folk remedy documented across many European cultures. This seemingly paradoxical treatment of inflammation with an irritating plant was remarkably effective, with modern research now validating this traditional practice through controlled clinical trials. Elderly people in rural areas would often keep a nettle patch specifically for this purpose.

Beyond medicine and food, nettle has extraordinary practical uses. Its fibrous stems were used for millennia to make cloth, cordage, rope, and fishing nets. Nettle fabric was comparable to linen and hemp, and was used to make sail cloth, clothing, and bags. During World War I, Germany used nettle fiber to supplement cotton shortages for military uniforms. The plant produces a strong, durable fiber that can be processed similarly to flax.

Nettle was also used as a source of green dye (from the leaves) and yellow dye (from the roots). It served as animal fodder, increasing milk production in cows and egg production in chickens. Dried nettle was mixed with animal feed throughout winter. As a companion plant, nettle improves the essential oil content of neighboring aromatic herbs and indicates fertile soil.

In the Victorian language of flowers, nettle symbolised cruelty or slander, reflecting its stinging nature, but it also represented remediation–the idea that what seems harsh may ultimately heal.

The plant embodies the principle that some of the most valuable medicines are often overlooked “weeds” that grow abundantly around us. Nettle’s aggressive growth and fierce protective mechanism belie its generous nutritive and healing gifts–a powerful friend disguised as a prickly adversary.

Additional Information

Exceptional Nutritive Properties: Nettle is one of the most nutrient-dense wild edible plants, containing approximately 30% protein (dry weight)–higher than most leafy vegetables–with a complete amino acid profile. The mineral content is extraordinary, often exceeding cultivated vegetables by several times. A nourishing nettle infusion (30-60g of leaf steeped overnight) provides more bioavailable minerals than most supplement tablets.

Companion Planting: Nettle is an excellent companion plant in gardens. It increases the essential oil content of neighboring aromatic herbs (basil, oregano, etc.), improves soil fertility through nutrient cycling, and attracts beneficial predatory insects. Some gardeners intentionally plant nettle in small patches for these benefits and for harvest.

Indicator Species: Nettle’s presence indicates nitrogen-rich, fertile soil. Areas where nettle thrives are excellent for establishing gardens or food forests. However, nettle can be very invasive and should be contained or managed carefully.

Sustainable Harvesting: When harvesting wild nettle, cut only the top 10-15 cm of young shoots, leaving the lower plant and roots intact. Plants will regrow and can be harvested again in 3-4 weeks. Harvest before flowering for best quality. Never harvest more than one-third of a nettle patch to ensure sustainability.

Preparation Tips for Long Infusions: For maximum mineral extraction, use 30-60 grams of dried nettle in 1 liter of boiling water, cover tightly, and steep for 4-8 hours or overnight at room temperature. This produces a dark, rich, slightly thick brew that is extraordinarily nourishing. Strain and refrigerate; consume within 24-36 hours. The taste is strongly “green” and mineral-rich. Some people add lemon or honey for palatability.

Cooking Fresh Nettle: Always wear gloves when harvesting and handling fresh nettle. To prepare as cooked greens: rinse thoroughly, place in a pot with just the water clinging to leaves (like spinach), cover, and steam for 1-2 minutes. The heat immediately destroys the stinging compounds (formic acid, histamine). Drain and use like spinach in any recipe. Nettle pairs well with garlic, butter, lemon, eggs, and pasta.

Nettle Seed: Traditionally used as a kidney and adrenal tonic, nettle seeds are harvested in late summer when green and immature (before fully brown) for best medicinal properties. Seeds can be eaten fresh (5-10 seeds daily), dried and powdered, or tinctured. They have a distinct, somewhat earthy flavor.

Hair Care: Nettle has a long traditional use for hair health. Infusions are used as a final rinse after shampooing to support scalp health, reduce dandruff, and promote shine. Some evidence suggests it may help with hair loss, though clinical data is limited.

Aotearoa/New Zealand Context: Nettle grows readily throughout New Zealand and is common in disturbed areas, along waterways, and in gardens. It can become weedy but is easily managed. Seeds and plants are available from some herb nurseries and seed companies. Fresh nettle can sometimes be found at farmers’ markets in spring. Wearing gloves, foragers can harvest wild nettle from clean areas (avoid roadsides and sprayed land). The long growing season in many parts of NZ allows for extended harvest periods. Nettle is not native to NZ but has naturalised extensively and is a valuable free food and medicine source.

Sources

Bone, K., & Mills, S. (2013). Principles and Practice of Phytotherapy: Modern Herbal Medicine (2nd ed.). Churchill Livingstone.

Chaurasia, N., & Wichtl, M. (1987). Flavonoids from the roots of Urtica dioica. Planta Medica, 53(4), 432-434.

Chevallier, A. (2016). Encyclopedia of Herbal Medicine (3rd ed.). Dorling Kindersley.

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Disclaimer: This monograph is for educational purposes only and is not medical advice. Please consult with a qualified healthcare practitioner before using any herbal remedy, especially if you are pregnant, nursing, taking medication, or have a known medical condition.