Rex Begonia (Begonia rex hybrids): Dramatic Foliage for High-Humidity Displays

Botanical Name: Begonia rex hybrids

A longtime favorite, Rex Begonia is grown for spectacular colorful, textured foliage. Large leaves display dramatic streaks, veins, and splashes in silver, pink, purple, cream, green, and burgundy—spiral-leaf types are especially striking.

Tiny insignificant flowers on tall stems—pinch off immediately to keep foliage looking its best.

Rhizomatous growth from thick fleshy rhizome just below soil surface. Repot in spring when rhizome outgrows pot. Shallow roots → shallow pot works.

Humidity Challenges

Rex Begonia can be difficult due to high humidity needs. Dry, brittle leaves = dry air. Terrarium, Wardian case, or glass cloche may be the solution.

Sometimes drops leaves and goes dormant in winter. If so: cut withered leaves, stop watering, enclose in plastic bag at 60°F (16°C). New growth in 6–10 weeks, then resume normal care.

Rex Begonia Care Quick Reference

• Origin: Southeast Asia and India
• Height: Up to 1 ft (30 cm)
• Light: Bright; no direct sun (scorches leaves). Thrives under fluorescent light.
• Water: Evenly moist always. Don't overwater—rhizomes rot in soggy soil. Avoid water on leaves (causes spots).
• Humidity: High. Below 50% RH? Pebble tray or humidifier. Don't mist—causes leaf spots.
• Temperature: 65–75°F (18–24°C)
• Soil: African violet mix works well
• Fertilizer: Every 2 weeks spring–fall with balanced liquid fertilizer at half strength. Stop for dormant plants.
• Propagation: Leaf cuttings in spring/summer. Cut healthy medium leaf with 1–2 in stem. Poke at 45° angle in moist 1:1 peat:perlite. Enclose in plastic bag for humidity. Warm (75–80°F/24–27°C), indirect light. Roots in 3–4 weeks; plantlets form in ~4 more weeks. Pot each plantlet at 3 leaves, remove parent leaf.