In short
- A perennial, expansive plant of fertile and ruderal habitats.
- The stinging hairs inject formic acid and histamine — after blanching it is edible.
- A valuable medicinal raw material and an ingredient of fertilising liquid manure.
- It spreads by runners, so it needs a confined spot.
- A host plant for tortoiseshell caterpillars — ecologically very valuable.
Botanical data
- Family
- Urticaceae (Urticaceae)
- Height
- 0.6–1.8 m
- Width
- 0.4–1 m
- Habit
- Upright
- Growth rate
- Fast
- Position
- Full sun, Partial shade
- Soil
- Loamy, Humus-rich
- pH reaction
- pH 5.5–7.5
- Moisture
- Moist, Moderate
- Bloom
- June–September
- Hardiness
- USDA 3a–9b
- Propagation
- By division, By runners, From seed
Characteristics
Upright, four-angled stems reach 0.6–1.8 m and are covered, like the ovate-lanceolate, toothed leaves, with stinging and ordinary hairs. The species is usually dioecious — the small, greenish flowers gathered in hanging or upright panicles are unisexual and wind-pollinated. Underground runners enable rapid, expansive colonisation.
Growing and care
Watering
Undemanding. On moist, fertile soil it grows lushly; in drought it wilts but quickly rebounds after rain or watering.
Fertilizing
It is itself an indicator of nitrogen-rich soils and a source of nutrients — its liquid manure serves to fertilise and strengthen other plants.
Planting
Because of the expansive runners it is best planted in a confined spot or a sunken container to control its spread.
Pruning
Cutting the young shoots stimulates the plant to put out tender, edible leaves; mowing before the seeds set limits self-seeding.
Companion plants
Good companions
Nettle liquid manure is a popular nitrogen feed and a natural strengthening spray for tomatoes; the proximity of nettle is regarded as beneficial to their condition.
The proximity of nettle is said to raise the content of essential oils in aromatic herbs.
Nettle is considered a plant that strengthens the aroma and resilience of neighbouring herbs.
Bad companions
Nettle spreads aggressively by runners and quickly crowds out weaker neighbours — it should be planted in a confined spot.
The evidence level indicates whether the relationship is backed by research, observation, or gardening tradition.
Diseases and pests
Toxicity
| For whom | Level | Notes |
|---|---|---|
| Humans | Mild | The stinging hairs inject a mixture of formic acid, histamine, serotonin and acetylcholine, causing a burning nettle rash. After blanching (cooking, drying) the plant is edible and harmless. |
| Dogs | Mild | Contact with the stinging hairs can cause local irritation of the skin and muzzle. |
| Cats | Mild | — |
History and origin
For centuries used in many ways: the young leaves as a nutritious vegetable and medicinal raw material (for anaemia, as a diuretic), the stems as a source of fibre for fabrics and cords, and the whole plant as a natural fertiliser and spray. In folk tradition, nettle liquid manure was the basic home-made garden remedy.
Uses
The young leaves are used in the kitchen (soups, pesto, teas) and in herbal medicine, and the whole plant to make a fertilising and strengthening liquid manure. In the garden it is worth leaving a controlled clump of nettles in a wild corner as support for butterflies and beneficial insects.
Trivia
- The sting subsides after scalding with boiling water, drying or blanching — only then do the leaves go into soups and infusions.
- Nettle patches are among the most important host plants for the caterpillars of tortoiseshell butterflies: the peacock, red admiral, comma and small tortoiseshell.
- Early-spring aphid colonies on nettle are a valuable, early food for ladybirds.
Frequently asked questions
Can nettle be safely eaten despite the sting?
Yes. The stinging hairs lose their activity after blanching, cooking or drying, so the young leaves are safe in soups, teas or pesto. They are picked with gloves, preferably in early spring.
How do you make nettle liquid manure?
Fresh shoots are covered with water (about 1 kg to 10 l) and left to ferment for 1–2 weeks, stirring. The fermented, diluted liquid is used as a nitrogen fertiliser and a strengthening spray.
How do you control the spread of nettle in the garden?
Nettle spreads by runners and seeds, so it is worth planting it in a sunken container and mowing it regularly before the seeds set. Keeping a compact clump in a wild corner combines control with benefit for butterflies.
Sources
- Plants of the World Online (POWO) — Urtica dioicaDatabase (GBIF, POWO…)
- RHS — Urtica dioica (common nettle)Institution / botanical garden
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