Urtica pilulifera aka Roman Nettle

Urtica pilulifera (Roman Nettle) is very easy to grow, as it is essentially a weed species that thrives in disturbed soils with minimal care. The main requirements are full sun exposure and consistently moist soil. It tolerates a wide range of soil types from sandy to clay and adapts to various pH levels. The primary challenge is managing its stinging hairs during handling—always wear thick gloves when working with this plant.

Urtica pilulifera propagates primarily through seeds. Sow seeds in spring in a cold frame or directly outdoors after the last frost. The seeds require no special treatment and germinate readily in moist soil. The plant can also spread vegetatively through underground rhizomes, which allows it to establish and survive in suitable habitats. Once established, it may self-seed if flower heads are left to mature.

Urtica pilulifera is a fast-growing annual that typically reaches 30-60cm (1-2 feet) in height, though it can grow up to 1 meter under optimal conditions with rich, moist soil. The plant has a stout, erect stem that may branch, with quadrangular (square-shaped) cross-section. It completes its entire lifecycle from germination to seed production within one growing season, flowering from June to September.

Yes, Urtica pilulifera produces inconspicuous greenish-white to yellow-green flowers from June to September. The flowers appear in elongated clusters called axillary racemes. The plant is monoecious, meaning individual flowers are either male or female, but both sexes occur on the same plant. Seeds ripen from July to October after successful wind pollination. The flowers are small and not ornamentally significant.

Urtica pilulifera is wind-pollinated and monoecious, meaning each plant bears both male and female flowers. However, the plant is not self-fertile, requiring cross-pollination between different individuals for successful seed production. The small, inconspicuous flowers are adapted for wind pollination rather than attracting insect pollinators. Seeds ripen approximately one to three months after flowering begins.

Urtica pilulifera is strictly an outdoor plant that cannot be grown indoors as it requires full sun and will not tolerate shade. It thrives in USDA hardiness zones 4-9 and is not frost tender. The plant naturally grows in disturbed soils including cultivated land, waste places, roadsides, and meadows. It prefers nitrogen-rich soil and develops the best fiber on deep, fertile soils. Native to the Mediterranean region, it has naturalized in parts of Northern Europe and North America.

Urtica pilulifera is generally resistant to pests and diseases due to its stinging hairs, which deter most herbivores. The plant actually serves as an important host for certain butterfly and moth caterpillars, which have evolved to feed on nettle species. Its robust, weedy nature means it rarely suffers from significant pest or disease problems. No major pest or disease issues are documented for this species in cultivation.

Yes, Urtica pilulifera is edible with an edibility rating of 3 out of 5. Young leaves can be cooked as a potherb or spinach substitute and are highly nutritious, rich in vitamins and minerals. The shoots can be used to make nettle beer, and the plant yields edible oil. Always wear thick gloves when harvesting, and only use young leaves as older leaves contain cystoliths that may irritate the kidneys. Cooking or drying completely neutralizes the stinging hairs.

Urtica pilulifera has a medicinal rating of 3 out of 5 with a long history of traditional use. The whole plant functions as an antiasthmatic, depurative, diuretic, galactogogue, haemostatic, and tonic. Traditionally used to treat anemia, excessive menstruation, hemorrhoids, arthritis, rheumatism, and skin conditions like eczema. Modern research has confirmed anti-inflammatory, antioxidant, and antihyperglycemic properties. Best harvested in May-June when flowering, then dried for later use.

Urtica pilulifera has an other uses rating of 3 out of 5, primarily valued for fiber production. The stems yield a strong, flax-like fiber historically used for rope, cloth, paper, and string since the Bronze Age. The plant produces dyes: green from leaves and stems, yellow from roots. An infusion of leaves makes an effective antidandruff hair treatment. As a companion plant, it reportedly increases essential oil production in neighboring herbs.

Urtica pilulifera thrives in temperate climates and tolerates a wide temperature range, growing in USDA zones 4-9. The plant is not frost tender, meaning it can withstand light frosts. Native to the Mediterranean and subtropical regions, it adapts well to both warmer and cooler temperate climates. As an annual, it completes its lifecycle during the warm growing season from spring through fall.

As an annual plant, Urtica pilulifera completes its entire lifecycle in one growing season. Sow seeds in spring after frost danger passes. During summer, maintain moist soil conditions and ensure full sun exposure. The plant flowers from June to September and sets seed from July to October. No overwintering care is needed as the plant dies after setting seed. Collect seeds in autumn if you wish to replant the following year.

Roman Nettle’s native range is Europe.

Roman Nettle should be watered regularly, allowing the soil to dry out between waterings.

Roman Nettle loves a well-draining soil. Perlite and vermiculite help with drainage, while coco coir adds organic matter, so a good potting soil mix will have all three. You can improve store-bought soil by adding some perlite to it.

Roman Nettle requires abundant, bright, and direct light to thrive. The best placement for this plant is within one foot of a window to ensure it receives enough light. If you live in an area with more extreme weather, such as hot summers or cold winters, you may need to adjust the placement of the plant accordingly. During hot summer months, it is important to place the plant away from full sun, as this can cause the leaves to yellow or burn. During cold winter months, it is best to move the plant closer to the window to take advantage of the extra light that can help it survive. By keeping an eye on the current weather in your area, you can make sure your Pill Bearing Nettle is always in the right place to thrive.

Once the Roman Nettle has doubled in size or after a year has passed, it should be moved to a new pot. By replacing the soil with fresh potting soil containing all the vital nutrients, your plant will receive all the sustenance it needs, negating the requirement for fertilizer. It's important to remember that plants get their energy from the sun, not fertilizer.

No verified data on the toxicity of this plant exists within Ploi's records. Should you, someone in your family, or your pet ingest plant material with an unknown toxicity level, it is recommended to seek medical advice.