Cycads (Cycadophyta)

Cycads

Cycadophyta

Ancient gymnosperms with prehistoric charm, bearing stiff pinnate fronds and cone-like reproductive structures. Slow-growing tree-like or shrubby plants.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Requires bright direct to partial sun; full sun supports healthy coning, while partial shade prevents leaf scorch in hot climates
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Watering Water deeply when the top 5–7 cm of soil dries out; avoid overwatering to prevent root rot
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Temperature Thrives in 18–30°C; tolerates brief light frosts but cannot survive prolonged temperatures below 10°C
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Characteristics

  • Leaf: Long, stiff pinnate fronds with leathery, glossy leaflets arranged in a dense crown at the top of the caudex
  • Reproductive Structure: Dioecious; male plants produce cone-shaped microstrobili, female plants produce large, seed-bearing megastrobili
  • Stem: Thick, woody caudex (trunk) covered in persistent, fibrous leaf bases
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Care Guide

Watering

Keep soil consistently moist but not saturated; increase frequency during heatwaves

Fertilization

Apply balanced slow-release fertilizer once at the start of growing season. Avoid over-fertilization, as cycads are slow-growing and sensitive to nutrient buildup

Composted banana peel tea:Use fully composted banana peels steeped in water for 24 hours; dilute 1:20 for root drenching to avoid nutrient burn
Pruning
  • Remove brown, dead fronds at the base to improve airflow and maintain a tidy appearance
  • Trim off spent cones after seed dispersal to conserve the plant's energy reserves
  • Avoid cutting healthy fronds, as they take years to mature and support photosynthesis
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion leads to vomiting, diarrhea, lethargy, and potentially fatal liver failure

Humans: Contains cycasin, a carcinogenic toxin; ingestion causes liver damage, abdominal pain, and vomiting

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Garden Uses & Culture

Culture: Symbolizes longevity and prehistoric resilience in tropical and subtropical cultural traditions

Usage: Ornamental landscaping; some species used in traditional medicine with strict toxicity precautions