Cooktown Orchid (Dendrobium bigibbum)

Cooktown Orchid

Dendrobium bigibbum

Vibrant magenta blooms bring tropical elegance to indoor spaces. Epiphytic flowering orchid; common name: Cooktown Orchid.

Partial sun
2–3/week
Moderate
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Plant Needs

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Sunlight Bright indirect light; avoid direct midday sun which can scorch leathery leaves
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Watering Water thoroughly when the top 2–3 cm of potting medium is nearly dry; empty excess water from saucers to prevent root rot
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Temperature Thrives in 18–25°C; tolerate brief cool periods down to 10°C but avoid frost exposure
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Characteristics

  • Leaf: Narrow, leathery, oblong leaves borne on upright pseudobulbs
  • Flower: Clusters of 3–8 bright magenta to purple blooms with a distinct, ruffled lip
  • Pseudobulb: Succulent, green to yellow-green stems that store water and nutrients
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Care Guide

Watering

Keep potting medium evenly moist but not waterlogged; mist pseudobulbs 2–3 times weekly to boost humidity

Fertilization

Diluted balanced orchid fertilizer every 2 weeks. Cease fertilization in autumn and winter when growth slows

Banana peel compost tea:Soak fully composted banana peels in water for 3 days; dilute 1:20 with water for root drenching; discard solid peels to avoid pest infestations and odor
Pruning
  • Remove spent flower spikes at the base to redirect energy to new pseudobulb growth
  • Trim dead or yellowing pseudobulbs to maintain plant health and appearance
  • Repot every 2–3 years in spring to refresh potting medium and prevent root binding
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no reported adverse effects

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: National floral emblem of Queensland, Australia; symbolizes tropical resilience

Usage: Ornamental indoor or greenhouse plant; used in cut flower arrangements for tropical-themed displays