Large-flowered hemp-nettle
Galeopsis speciosa · Lamiaceae
The gardener's calendar
Ideal time to plant large-flowered hemp-nettle: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Lamiaceae (mints and deadnettles)
- Type
- Annual or biennial herbaceous plant
- Adult size
- 30 to 80 cm in height
- Flowering
- Summer to autumn (July to September)
- Foliage
- Deciduous, medium green, slightly pubescent
- Hardiness
- Low hardiness, prefers temperate climates
- Origin
- Central and Northern Europe
- Growth
- Rapid during the growing season
Care
Light exposure
Place your spotted deadnettle in full sun to partial shade for optimal flowering. Areas with at least 4 to 5 hours of direct sunlight are ideal. A location sheltered from strong winds promotes better flower display.
Soil
Prefer well-drained, fresh, slightly fertile soil that is preferably neutral to slightly alkaline. Improve heavy soils with compost or sand. Good drainage is essential to prevent root suffocation in winter.
Watering
Water regularly during the growing season to maintain fresh but not waterlogged soil. Space out watering in autumn and reduce it in winter. Adjust frequency according to climate conditions and soil type.
Fertilizer
A balanced fertilizer application in early spring is generally sufficient. Avoid excess nitrogen which would promote foliage at the expense of flowers. A light monthly application during flowering can support flower production.
Pruning and deadheading
Pinch young stems to encourage denser branching and better shape. Remove spent flowers regularly to extend flowering. Cut back at the end of the season or allow the plant to self-seed naturally if desired.
Diseases and pests
Spotted deadnettle is generally robust, but watch for powdery mildew in humid and stagnant conditions. Aphids may occasionally infest it. Ensure good air circulation and avoid prolonged foliage moisture to prevent fungal problems.
Did you know?
Spotted deadnettle has long been used in traditional herbal medicine in Northern Europe for its supposed anti-inflammatory properties. Its scientific name, from the Greek "galeê" (weasel) and "opsis" (appearance), reflects the particular shape of its bilabiate flowers which reminded ancient botanists of a weasel's snout.
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.
Add this plant to my garden →Plants from the same family
- ThymeThymus vulgaris
- LavenderLavandula angustifolia
- SageSalvia officinalis
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- RosemarySalvia rosmarinus
- BugleAjuga reptans
Tips generated and checked by Viridia — adapt them to your local climate.