Spiked Flatcap (Platycapnos spicata)

Spiked Flatcap

Platycapnos spicata

Delicate spiked blooms add soft texture to rock gardens. Low-growing herbaceous perennial; common name: Spiked Flatcap.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Bright partial sun; tolerate light shade, avoid intense midday summer sun to prevent leaf scorch
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Watering Water thoroughly when the top 2 cm of soil feels dry; avoid waterlogging to prevent root rot
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Temperature Thrives in cool temperate to Mediterranean climates; tolerate light frost down to 5°C but protect from hard freezes
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Characteristics

  • Leaf: Basal rosette of finely divided, fern-like green leaves with a soft texture
  • Flower: Dense upright spikes of small, pale pink to lavender tubular blooms with subtle yellow throats
  • Stem: Slender, branching green stems with sparse, reduced foliage
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Care Guide

Watering

Keep soil evenly moist during active growth periods

Fertilization

Apply diluted balanced liquid fertilizer once every 2 weeks. Use a low-nitrogen fertilizer to promote flowering rather than foliage growth

Eggshell powder topdress:Crush thoroughly dried eggshells into a fine powder; sprinkle a thin layer on the soil surface to improve drainage and add calcium; avoid direct contact with plant roots
Pruning
  • Deadhead spent flower spikes promptly to encourage prolonged blooming
  • Trim back wilted foliage in late autumn to tidy the planting area
  • Thin overcrowded clumps in early spring to improve airflow and reduce disease risk
  • Remove any damaged or yellowing leaves throughout the growing season
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Contains alkaloids that may cause mild gastrointestinal distress if ingested, per poppy family toxicity profiles

Humans: Contains isoquinoline alkaloids; ingestion of large amounts may cause mild gastrointestinal irritation

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental rock garden and alpine plant; used in xeriscaping for low-water landscapes