Compass Plant (Silphium laciniatum)

Compass Plant

Silphium laciniatum

Its leaves align with the sun like a living compass, tracking light through the day. Tall herbaceous perennial; common name: compass plant.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Requires full sun exposure for optimal growth and flowering; tolerates minimal partial shade in hot climates
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Watering Water deeply when the top 5–7 cm of soil is dry; drought-tolerant once established
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Temperature Hardy to severe winter cold; withstands summer heat in temperate prairie regions
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Characteristics

  • Leaf: Large, deeply lobed basal leaves; upper leaves smaller, less lobed; align vertically to track sunlight
  • Flower: Yellow daisy-like composite flower heads, 7–10 cm diameter; central disc florets surrounded by ray florets
  • Stem: Stout, hairy, unbranched or sparsely branched upright stem
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Care Guide

Watering

Keep soil consistently moist during active growth; avoid waterlogging

Fertilization

Diluted balanced organic feed once every 4 weeks. Avoid synthetic fertilizers to support native pollinator health

Composted banana peel tea:Soak fully composted banana peels in water for 24 hours; dilute 1:20 for root drench; discard solids to avoid pest infestations
Pruning
  • Deadhead spent flower heads to encourage prolonged blooming and prevent self-seeding if desired
  • Cut back stems to ground level in late autumn after frost kills foliage
  • Remove yellowing basal leaves to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no reported toxicity

Humans: Non-toxic to humans; no known adverse effects from ingestion or contact

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Garden Uses & Culture

Culture: Symbolizes resilience and adaptability in native prairie ecosystems

Usage: Native pollinator host plant; supports bees, butterflies, and beneficial insects