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Hemp-nettle

Galeopsis tetrahit · Lamiaceae

The gardener's calendar

The right move for September

Ideal time to plant hemp-nettle: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Deciduous
Flowering
Summer to fall (June to October)
Mature size
12 to 24 inches tall
Growth
Fast
Hardiness
Very hardy (down to -4°F / -15°C)
Origin
Temperate Europe
Soil type
All types, even poor soils
Plant type
Annual or biennial herbaceous plant

Care

Watering

Water regularly during the growing season, especially in dry weather. Once established, this hardy plant tolerates dry periods well. Avoid excess moisture, which can promote fungal issues.

Light Exposure

Plant your hemp-nettle in full sun or partial shade. It thrives in both conditions but flowers more abundantly in sunlight. It appreciates good light for generous blooming.

Soil

This plant is undemanding and adapts to all soil types, even poor or chalky soils. Well-drained soil is preferable to prevent waterlogging. No special amendments are generally needed.

Pruning and Pinching

Pinching young stems encourages bushier growth and more generous flowering. You can remove spent flowers to extend the blooming period. At season's end, remove dried stems.

Fertilizing

A moderate application of balanced fertilizer in spring is more than enough. Avoid excessive nitrogen, which encourages foliage at the expense of flowers. This hardy, undemanding plant generally doesn't need regular feeding.

Diseases and Pests

This plant is generally robust and rarely troubled by disease. Powdery mildew or downy mildew can occur in excessively humid conditions or poor air circulation. Ensure good airflow and avoid wetting the foliage when watering.

Did you know?

Hemp-nettle was once used in folk medicine for its supposed anti-inflammatory and expectorant properties. Its name "tetrahit" refers to its four characteristically well-marked angles on the stem. It's also a highly valued nectar plant, much appreciated by bees and pollinators in summer.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.