Mountain Hibiscus (Thespesia grandiflora)

Mountain Hibiscus

Thespesia grandiflora

Large, showy blooms glow like tropical lanterns against glossy foliage. Evergreen flowering tree; common name: Mountain Hibiscus.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Prefers full sun for optimal flowering; tolerate partial afternoon shade in extremely hot, arid climates
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Watering Water deeply when the top 5 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Thrives in 20–30°C; protect from frost and temperatures below 10°C to avoid leaf damage
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Characteristics

  • Leaf: Oval to heart-shaped, glossy dark green, 10–20 cm long with pointed tips and smooth margins
  • Flower: Funnel-shaped, creamy white fading to pale yellow then deep pink/red, 10–15 cm in diameter with prominent yellow stamens
  • Stem/Bark: Smooth gray-brown bark; young stems covered in fine, soft hairs
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Care Guide

Watering

Water 1–2 times weekly; increase frequency during prolonged heatwaves

Fertilization

Apply balanced slow-release granular fertilizer. Avoid over-fertilizing, as excessive nitrogen can reduce bloom production

Composted banana peel tea:Soak fully composted banana peels in water for 24 hours; dilute the tea 1:20 with water before applying as a root drench to prevent nutrient burn
Pruning
  • Remove dead, damaged, or crossing branches in early spring to improve air circulation
  • Deadhead spent blooms promptly to encourage additional flowering throughout the season
  • Trim to maintain desired tree shape; avoid heavy pruning in late autumn or winter to prevent stress
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No documented toxicity to cats

Humans: No known toxic effects from ingestion or contact

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Garden Uses & Culture

Culture: Symbolizes tropical resilience and natural beauty in Caribbean regional horticulture

Usage: Ornamental shade tree for gardens; provides nectar for bees, butterflies, and hummingbirds