Siam Hoya (Hoya siamica)

Siam Hoya

Hoya siamica

Waxy star-shaped flowers glow like tiny porcelain. Evergreen epiphytic vine; common name: Siam Hoya.

Partial sun
1/week
Beginner
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Plant Needs

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Sunlight Bright indirect light; avoid direct midday sun which can scorch foliage; tolerate low light for short periods
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Watering Allow top 2–3 cm of soil to dry completely between waterings; avoid waterlogged substrate to prevent root rot
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Temperature Thrives in 18–25℃; protect from temperatures below 10℃ to prevent leaf drop and stunted growth
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Characteristics

  • Leaf: Thick, leathery elliptical leaves with glossy dark green upper surface
  • Flower: Clustered star-shaped blooms with waxy texture; pale pink to white petals with deep red centers
  • Stem: Slender succulent trailing stems with aerial roots for anchorage and moisture uptake
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Care Guide

Watering

Keep substrate evenly moist but not soggy

Fertilization

Diluted balanced feed every 4 weeks. Avoid fertilizing in winter when growth slows to prevent salt buildup in soil

Banana peel tea:Soak chopped banana peels in water for 3 days, dilute 1:20 with water for root drench; discard solid peels to avoid odor and pest issues
Pruning
  • Trim leggy stems in early spring to encourage bushier, compact growth
  • Leave spent flower spikes intact to promote reblooming in subsequent seasons
  • Remove yellowing or damaged foliage to maintain plant health and airflow
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic; no adverse effects from ingestion

Humans: No toxic effects reported from ingestion or skin contact

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Garden Uses & Culture

Culture: Symbolizes loyalty and enduring friendship in some Southeast Asian tropical cultures

Usage: Ornamental hanging plant; indoor decor for bright windowsills or hanging baskets