Imperial Hoya (Hoya imperialis)

Imperial Hoya

Hoya imperialis

Large, fragrant blooms hang like celestial lanterns. Evergreen epiphytic climbing vine; common name: Imperial Hoya.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Bright indirect light; avoid direct midday sun which can scorch leaves; sufficient light is required to trigger blooming
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Watering Water thoroughly only when the top 2–3 cm of the growing medium is completely dry; avoid overwatering to prevent root rot
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Temperature Thrives at 18–25℃; protect from temperatures below 12℃ to prevent leaf drop and stunted growth
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Characteristics

  • Leaf: Large leathery oblong-ovate leaves with prominent veins; dark green, up to 30 cm long
  • Flower: Umbel inflorescences with 10–20 star-shaped blooms; creamy white with deep pink centers, intensely fragrant at night
  • Stem: Woody trailing or climbing stems with aerial roots for anchorage and moisture uptake
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Care Guide

Watering

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

Fertilization

Diluted balanced liquid feed every 2 weeks. Discontinue fertilization in autumn and winter when growth slows to avoid nutrient buildup

Banana peel compost tea:Use only fully composted banana peels; soak in water for 24 hours, dilute 1:20 for root drench; avoid raw peels to prevent pest infestations
Pruning
  • Avoid cutting off flower spurs, as blooms emerge from the same spurs annually
  • Trim dead, yellowing leaves and overgrown stems in spring to maintain shape and improve airflow
  • Train climbing stems to supports with soft ties to prevent stem damage
  • Remove spent flower umbels to redirect energy to new growth and future blooms
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; calcium oxalate crystals may cause oral pain, drooling, vomiting, and difficulty swallowing

Humans: Sap contains calcium oxalate crystals; contact may cause mild skin irritation, ingestion irritates mouth and throat

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Garden Uses & Culture

Culture: Symbolizes devotion and enduring love in some Southeast Asian tropical cultures

Usage: Ornamental indoor climbing vine; prized for its large, fragrant blooms