Great Nettle

Urtica dioica

Great Nettle (Urtica dioica) is a perennial herb with stinging hairs that commonly forms dense colonies. It favors moist fertile soils and flowers in late spring and summer.

Key Facts

  • Herbaceous perennial with stinging hairs on leaves and stems
  • Spreads by rhizomes and can form dense colonies
  • Typically upright stems reaching about 2–5 ft (60–150 cm)
  • Small greenish flowers appear in drooping clusters in late spring to summer
  • Prefers moist fertile soils but tolerates a wide range of conditions
  • Grows in full sun to part shade and often favors nitrogen rich sites
  • Leaves and shoots are edible when cooked but hairs cause skin irritation if handled raw
  • Can be persistent or invasive where conditions are favorable

Great Nettle (Urtica dioica) is a hardy perennial herb with stinging hairs that commonly forms dense colonies. It favors moist fertile soil and produces small greenish flowers in drooping clusters from late spring into summer.

Identification

Urtica dioica has upright stems that typically reach about 25 ft 60150 cm. Leaves and stems carry stinging hairs that cause immediate skin irritation on contact. Flowers are small, greenish and hang in drooping clusters during the late spring and summer months.

Where to grow and best uses

Grow Great Nettle in moist, fertile spots in full sun to part shade where its colony-forming habit fits the landscape. It works well in wild or naturalized areas and along sheltered edges where nitrogen rich soils support vigorous growth. Tradeoff: it provides cover and wildlife forage but can be persistent or invasive where conditions are favorable.

Soil light and hardiness

Great Nettle prefers moist fertile, well drained soils but tolerates a wide range of soil types. Plants do poorly in permanently waterlogged sites and may be stunted in very dry compacted soil. It tolerates full sun to part shade and performs best where moisture and fertility are adequate. In temperate climates it is generally hardy to about USDA zones 3 to 9.

Planting and propagation

Propagate by seed or by dividing rhizomes and rootstock. New plants also establish from root fragments left in the soil. For practical work such as dividing or transplanting choose a time when the soil is workable and plants can reestablish their roots.

Watering and expected effects

Keep plants evenly moist for vigorous growth. In moist fertile sites nettles spread quickly and form dense stands. Dry conditions lead to smaller, less vigorous plants. Excessive waterlogging reduces vigor rather than encouraging growth.

After-flowering care and management

Cutting flower stalks before seed set reduces self-seeding and can limit spread. To remove an unwanted patch dig out rhizomes thoroughly because root fragments resprout. Repeated cutting or mowing will weaken colonies over time but may be required for several seasons.

Edibility and safety

Leaves and young shoots are edible when cooked and lose their sting with heat or drying. Raw handling causes painful stings and skin irritation. For pet or child exposure consult local poison control or veterinary resources for specific guidance.

Control and invasiveness

Great Nettle spreads by underground rhizomes and can form dense colonies that crowd other plants. Manage spread by removing rhizomes, cleaning soil of root fragments after digging and cutting growth back repeatedly until the root system weakens. Consider containment or choosing a different plant where aggressive spread is unacceptable.

Frequently asked questions

How fast does Great Nettle grow?
Growth rate varies with site fertility and moisture. In moist, fertile ground it can spread rapidly by rhizomes and form dense colonies within a few seasons; in poorer or drier sites spread is slower.
When does Great Nettle flower?
Flowers appear in late spring into summer. In temperate Northern Hemisphere locations this often falls between May and August, with local timing varying by climate.
Can I eat Great Nettle?
Yes, leaves and shoots are edible when cooked or dried to remove the stinging hairs. Avoid raw handling without protective gloves.
Is Great Nettle poisonous to pets?
Stinging hairs cause local irritation. It is not widely listed as systemically toxic but check local poison control or the ASPCA database for definitive pet safety information.
What is the best way to control spread?
Remove rhizomes and root fragments when digging, cut back flowering stems before seeds set and use repeated mowing or cutting to weaken colonies. Persistent monitoring is needed because roots can resprout.

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