Begonia rex
Begonia rex (Painted-Leaf) Care Guide
Featured photobegonia-rex.jpgBegonia rex is the painted-leaf begonia, an Indian rhizomatous species and the parent of countless modern hybrid cultivars. The leaves are the entire reason to grow it — bold combinations of silver, pink, purple, red, and green in spirals, marbling, and concentric bands. It is more humidity-loving and flowering-shy than cane begonias and works well as a colourful foliage accent.
Care facts at a glance
- Light
- Bright indirect
- Water
- Water when the top 2 cm of mix has dried; never let the rhizome dry out completely.
- Humidity
- 50–70 %
- Temperature
- 16–24 °C
- Soil
- Light, airy mix of peat or coir with perlite; rhizomes hate compacted soil.
- Toxicity
- Toxic if eaten in quantity due to calcium oxalates; treat as ornamental only. (humans) · Toxic to cats and dogs per ASPCA Begonia listing. (pets)
- Origin
- Forests of northeastern India and surrounding Himalayas.
- Mature size
- 20 to 40 cm tall.
Overview
Begonia rex was introduced to European cultivation in the 1850s and became the parent of modern Rex Cultorum hybrids — hundreds of cultivars varying wildly in leaf shape, colour, and pattern. All share the same care.
Care Priorities
- Bright filtered light from an east or shaded south window.
- Keep the mix lightly moist — rhizomes hate both drought and waterlogging.
- Higher humidity than cane begonias; bathrooms and grouped plants help.
- Water at the soil only and improve airflow to prevent mildew.
Common Problems
Powdery mildew is the most common disease. Crispy edges are dry air. Sudden leaf collapse is usually rhizome rot from overwatering. Many rex begonias go partly dormant in winter — leaf loss with a healthy rhizome is normal.
Sources & further reading (3)
- encyclopedia — accessed 2026-04-28
- botanical-garden — accessed 2026-04-28
- toxicity-database — accessed 2026-04-28
Frequently asked questions
Will my rex begonia flower?
It can, with small pale-pink flower clusters, but most cultivars are grown for foliage and the flowers are unimpressive. Many growers cut them off.
How do I propagate from a leaf?
Cut a leaf, lay it flat on moist mix with the veins slit (or pegged down), and small plants emerge from the cut veins within weeks. Leaf-vein propagation is one of the rex begonia hallmarks.
Why does it die back in winter?
Many rex hybrids go partly dormant in low light and cool conditions. Reduce water, keep the rhizome just barely moist, and new growth typically returns in spring.
