Rex Begonia (Begonia rex-cultorum)

Rex Begonia

Begonia rex-cultorum

Velvety leaves paint living art, each a unique watercolor. Evergreen foliage plant; common name: King Begonia.

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 velvety leaves
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Watering Water when the top 2 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Thrives at 18–22°C; protect from temperatures below 12°C to avoid leaf discoloration and damage
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Characteristics

  • Leaf: Heart-shaped, velvety with silver, purple, or green variegation; asymmetrical base
  • Stem: Short, fleshy, green to reddish-brown
  • Flower: Small, pink or white clusters; less ornamental than foliage
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Care Guide

Watering

Keep soil evenly moist but not waterlogged; mist leaves regularly to maintain 50–60% humidity

Fertilization

Diluted balanced liquid fertilizer every 4 weeks. Avoid fertilizing in autumn and winter when growth slows

Banana peel compost tea:Compost banana peels for 2 weeks, steep in water for 24 hours, dilute 1:20 before applying to soil; avoid applying directly to leaves to prevent fungal growth
Pruning
  • Remove yellow or damaged leaves at the base to maintain plant health and improve airflow
  • Pinch back leggy stems to encourage compact, bushy growth
  • Trim spent flower stalks to redirect energy to foliage development
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion may cause drooling, vomiting, oral pain, and difficulty swallowing

Humans: Contains soluble calcium oxalate crystals; ingestion causes oral irritation and swelling; may trigger mild skin rash in sensitive individuals

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Garden Uses & Culture

Culture: Symbolizes uniqueness and artistic expression due to its highly varied, decorative leaf patterns

Usage: Ornamental indoor foliage plant; commonly used in terrariums, tabletop displays, and hanging planters