Rex begonia care guide
Begonia rex
Quick answer
Water your Rex begonia when the top 3 cm (1.2 in) of soil feel dry to the touch. In summer that’s typically every 6 to 8 days.
- WateringEvery 6 to 8 days · summer
Every 11 to 17 days · winter - LightBright, indirect light
- Climate13–24 °C (55–75 °F)
- Pet safetyToxic to cats and dogs
Not sure it’s this plant?Get the free Botanicaly app and find out with a photoWhen and how to water
3 cm (1.2 in)
- Summer · Jun–AugEvery 6 to 8 days
- Winter · Dec–FebEvery 11 to 17 days
Use room-temperature water and let any excess drain. Never leave the pot sitting in standing water.
Adjust the timing for the light at the plant, the pot’s size and material, and the humidity indoors. Terracotta dries faster than glazed ceramic.
Work out your own rhythm with the watering calculator.
Light and placement
Bright, indirect light
Rex begonia thrives in bright, indirect light. Direct midday sun can scorch the leaves. Place it 1–2 meters back from an east or west window, or behind a sheer curtain on a south window.
Feeding
Feed your Rex begonia every 30 days while it’s actively growing. Use a balanced liquid houseplant fertilizer at half the strength on the label, and only on soil that’s already damp. Feeding dry roots can scorch them.
When growth pauses, skip the fertilizer and let it rest.
Temperature & humidity
Climate13–24 °C (55–75 °F)
Humidity50–70%
During leafy growth, aim for 13–24 °C (55–75 °F). For routine indoor care, keep it above about 13 °C (55 °F) and avoid cold drafts. This is a care guideline, not an exact damage threshold. Cooler overwintering depends on the species and its rest conditions.
It does best at 50–70% humidity. It doesn’t need misting.
Common problems
Yellowing, drooping, and dry edges often point to watering or drainage. Compare the signs before changing the routine.
Find what’s wrong
Toxic to pets?
Yes. Keep it out of reach.
Pet-safety information in the JungleBook uses ASPCA reference data where available. It is reference information, not veterinary advice.
Full Rex begonia toxicity guide →
Pet-safe alternatives with similar light
Common questions
How often should I water a Rex begonia?
Water your Rex begonia (Begonia rex) when the top 3 cm (1.2 in) of soil feel dry to the touch. In summer, that’s typically every 6 to 8 days. In winter, slow down to every 11 to 17 days.
How much light does a Rex begonia need?
Rex begonia thrives in bright, indirect light. Direct midday sun can scorch the leaves. Place it 1–2 meters back from an east or west window, or behind a sheer curtain on a south window.
Is Rex begonia safe for cats and dogs?
The plant contains soluble calcium oxalates. Chewing it can cause oral irritation, drooling, and vomiting. Keep Rex begonia out of reach of pets, or pick a non-toxic alternative like false aralia, string of turtles, spider plant, or pinstripe calathea.
Why is my Rex begonia turning yellow or drooping?
Yellowing, drooping and brown tips can have several causes. Check the potting mix before adding water and follow this plant’s watering and rest instructions. If the mix is still wet, do not add more water. Check drainage and roots, then light, humidity, water quality and pests. Faded color or webbing alone does not show that the roots need water.
Sources5 references
- Royal Botanic Gardens, Kew: Plants of the World OnlineAccepted name and taxonomic record
- Royal Horticultural SocietyRex and other rhizomatous begonia care · problems · propagation · Plant profile · growing conditions · cultivation · pests
- North Carolina State University Extension Gardener Plant ToolboxDescription · cultural conditions · insects, diseases, and other plant problems
- University of Florida IFAS ExtensionCultivation Management · Growing Temperature · Potting Medium and Irrigation · Light · Fertilizer · Pests and Disease
- ASPCA Animal Poison ControlScientific name · toxicity · toxic principles · clinical signs
- How we check our plant advice
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