Hutchinsia (Hornungia petraea)

Hutchinsia

Hornungia petraea

Tiny, starry blooms carpet rocky crevices with delicate white light. Low-growing alpine annual; common names: Hutchinsia, Rock Whitlowgrass.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Thrives in full sun to partial shade; tolerates intense alpine sunlight
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Watering Water when the top 1 cm of soil is dry; avoid waterlogging to prevent root rot
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Temperature Frost-hardy, adapted to cool alpine conditions; avoid prolonged temperatures above 25°C
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Characteristics

  • Leaf: Basal rosette of spoon-shaped, slightly hairy leaves; stem leaves are smaller, linear and sparsely distributed
  • Flower: Tiny four-petaled white star-shaped blooms, clustered at upright stem tips
  • Stem: Slender, branching, upright to spreading stems with minimal foliage
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Care Guide

Watering

Keep soil consistently moist but not saturated

Fertilization

Diluted balanced liquid feed once monthly. Use a low-strength feed to avoid over-fertilizing delicate root systems

Eggshell powder top-dressing:Crush clean, dried eggshells into fine powder; sprinkle lightly on soil surface to boost soil calcium levels without burning roots
Pruning
  • Deadhead spent blooms to encourage self-seeding and extend flowering period
  • Thin overcrowded rosettes to improve air circulation
  • Remove yellowing basal leaves to maintain a tidy mat habit
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No listed toxicity to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental groundcover for rock gardens and alpine landscapes