Herb Robert (Geranium robertianum)

Herb Robert

Geranium robertianum

Delicate, fern-like foliage carries a sharp scent when crushed. Low-growing herbaceous perennial; common name: Herb Robert.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Prefers partial shade to full sun; tolerates dappled woodland light; avoid intense midday summer sun in hot regions
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Watering Water when the top 2 cm of soil is dry; avoid waterlogging to prevent root rot
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Temperature Hardy to -15°C; thrives in cool temperate conditions; avoid prolonged exposure to temperatures over 30°C
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Characteristics

  • Leaf: Palmate, deeply lobed, fern-like; green to reddish in full sun
  • Flower: Small, pink to purple five-petaled blooms; clustered at stem tips
  • Stem: Slender, reddish, hairy; sprawling or upright growth form
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Care Guide

Watering

Keep soil evenly moist; water 1–2 times weekly

Fertilization

Diluted balanced organic feed every 4 weeks. Avoid over-fertilizing, as excessive nutrients can reduce flowering

Composted banana peel tea:Compost banana peels for 2 weeks, steep in water for 24 hours, dilute 1:20 for root drench; discard solids to avoid odor and pest infestations
Pruning
  • Deadhead spent flowers regularly to encourage prolonged blooming
  • Trim back leggy stems in mid-summer to promote bushier growth
  • Remove yellowing or damaged foliage to maintain plant health and airflow
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic to cats

Humans: No known toxic effects to humans

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Garden Uses & Culture

Culture: N/A

Usage: Traditional mild antiseptic and astringent; ornamental ground cover for woodland gardens