Common Hemp-nettle (Galeopsis tetrahit)

Common Hemp-nettle

Galeopsis tetrahit

It blooms with spotted tubular flowers, a humble meadow gem. Annual herbaceous wildflower; common name: common hemp-nettle.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates disturbed, low-nutrient soils in meadows or roadside verges
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Watering Drought-tolerant; only water during prolonged dry spells to avoid root rot
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Temperature Hardy to moderate frost; adapts to temperate seasonal temperature fluctuations
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Characteristics

  • Leaf: Opposite, ovate to lanceolate leaves with serrated margins and densely hairy surfaces
  • Flower: Tubular two-lipped flowers, pink to purple with white spots on the lower lip to guide pollinators
  • Stem: Squarish, bristly stem with downward-pointing hairs for protection against herbivores
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Care Guide

Watering

Water occasionally during extended dry periods; allow soil to dry between waterings

Fertilization

Minimal diluted feed only if grown in extremely poor soil. Use low-nitrogen feed to avoid excessive foliage growth at the expense of flowering

Eggshell powder topdress:Crush fully dried eggshells to fine powder; dust lightly on soil surface to add calcium without burning shallow roots
Pruning
  • Deadhead spent flowers to prevent unwanted self-seeding in managed gardens
  • Trim back yellowing or diseased foliage to improve airflow and reduce fungal growth
  • Cut stems to ground level after flowering to tidy wildflower beds for winter
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No listed toxicity to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: N/A

Usage: N/A