Carniolan Masterwort (Astrantia carniolica)

Carniolan Masterwort

Astrantia carniolica

Delicate pincushion blooms add soft charm to shaded borders. Herbaceous perennial wildflower; common name: Carniolan masterwort.

Partial sun
1–2/week
Beginner
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Plant Needs

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Sunlight Partial to full shade; tolerates dappled morning sun, avoid harsh midday direct sun that can scorch foliage
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Watering Water thoroughly when the top 2–3 cm of soil dries out; avoid waterlogging to prevent root rot
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Temperature Hardy to -15°C; prefers cool to temperate conditions, avoid prolonged heat above 28°C
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Characteristics

  • Leaf: Basal rosette of deeply lobed, glossy green leaves with serrated margins; stem leaves are smaller and divided.
  • Flower: Compact, pincushion-like umbels surrounded by papery, pale pink to white bracts.
  • Stem: Slender, upright green stems with fine, soft hairs.
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Care Guide

Watering

Keep soil consistently moist but not soggy

Fertilization

Diluted feed once every 4 weeks. Use low-nitrogen, phosphorus-rich diluted feed to support abundant blooming

Composted banana peel tea:Steep fully composted banana peels in water for 3 days; dilute 1:20 for root drench to avoid nutrient burn
Pruning
  • Remove spent blooms promptly to encourage prolonged flowering through mid-summer
  • Cut back dead foliage to ground level in late autumn to prepare for winter dormancy
  • Divide overcrowded clumps every 3–4 years in early spring to maintain plant vigor
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirms no known toxicity to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden border plant; cut flower for fresh floral arrangements