Knawel (Scleranthus biflorus)

Knawel

Scleranthus biflorus

Tiny, cushion-like foliage forms a soft green carpet. Low-growing evergreen groundcover.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates coastal wind exposure and salt spray
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Watering Water deeply when top 1 cm of soil is dry; drought-tolerant once established
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Temperature Hardy to light frosts; avoid prolonged extreme heat above 28°C
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Characteristics

  • Leaf: Tiny, linear, bright green leaves densely packed along stems; no petioles
  • Flower: Inconspicuous, pale greenish-white, paired at stem apices; lack true petals
  • Stem: Slender, branching, prostrate stems form tight, compact cushions
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Care Guide

Watering

Keep soil slightly moist during active growth periods

Fertilization

Diluted low-nitrogen feed once every 2 months. Use only diluted, balanced feeds to avoid disrupting compact growth form

Eggshell powder topdressing:Crush dried eggshells to fine powder; sprinkle lightly on soil surface; avoid direct contact with stems to prevent fungal growth
Pruning
  • Trim back straggly stems in early spring to maintain compact cushion form
  • Remove dead or discolored foliage to improve airflow and appearance
  • Avoid heavy pruning; only light shaping as needed to preserve groundcover density
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No reported toxicity to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Groundcover for rock gardens, alpine troughs, and coastal landscape edging