Plant care guides
Rex begonia care guide Begonia rex
How to grow and care for Rex begonia at home. Spectacular leaf patterns.
- Light
- Medium / indirect light
- Watering (summer)
- Every 7 to 10 days
- Watering (winter)
- Every 14 to 21 days
- Pet safety
- Toxic to cats and dogs
- Difficulty
- Moderate
- Scientific name
- Begonia rex
- Origin
- India/SE Asia
- Humidity
- 50-70%
Fun fact
Every patterned-leaf rex begonia in cultivation descends from a single Indian species accidentally packed in moss with another plant shipment in 1856.
When and how much water
Water Rex begonia when the top 2 to 3 cm of soil feel dry to the touch. In summer that’s typically every 7 to 10 days; in winter slow down to every 14 to 21 days. Use room-temperature water and let any excess drain — never leave the pot sitting in standing water.
- Every 14 to 21 days
- Every 7 to 10 days
The real schedule depends on three things the calendar can’t see: the actual light at the plant, the pot’s size and material (terracotta dries faster than glazed ceramic), and your local humidity. Botanicaly’s app retunes the schedule from those signals on every reminder.
How bright a spot it needs
Rex begonia thrives in bright, indirect light. Direct midday sun can scorch the leaves. The ideal lux range is 2,000 - 10,000 lux. In practical terms, place it 1-2 meters back from an east or west window, or behind a sheer curtain on a south window.
Feeding
Feed 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
Rex begonia is comfortable between 18 and 24 °C. Below 15 °C the leaves start taking damage, so keep it clear of cold drafts and unheated rooms.
It does best at 50–70% humidity. It doesn’t need misting.
Common problems
Most Rex begonia problems trace back to watering — here’s how to read the leaves.
Signs of overwatering
Watch for
- Yellowing leaves
- Mushy rhizome
- Root rot
- Drooping leaves
Let the soil dry further between waterings and make sure the pot drains freely — soggy roots are the usual cause.
Signs of underwatering
Watch for
- Crispy leaf edges
- Curling leaves
- Faded leaf color
- Dry brittle leaves
Water a little more often and don’t let the soil go bone-dry for long.
Toxic to pets?
YesToxic to pets.
Toxic to cats and dogs if chewed. Keep Rex begonia out of reach of pets, or pick a non-toxic alternative like Air plant, Pink quill, or Spider plant.
Pet-safe alternatives with similar light: Air plant, Pink quill, Spider plant. See all pet-safe alternatives →
Pet-safety information for catalog plants uses ASPCA reference data where available. It is reference information, not veterinary advice.
Propagation
Grow more Rex begonia from a cutting.
- Choose a healthy, mature leaf (not old and leathery, not brand new and soft).
- Pull the leaf off cleanly at the base or cut it with a clean knife, keeping a small section of petiole (leaf stalk) attached if possible.
- Let the cut end callous over in open air for 30–60 minutes — this reduces the risk of rot.
Common questions
How often should I water a Rex begonia?
Water your Rex begonia (Begonia rex) when the top 2 to 3 cm of soil feel dry to the touch. In summer, that’s typically every 7 to 10 days; in winter, slow down to every 14 to 21 days. Botanicaly’s app tunes this further based on your home’s actual light, pot size, and local weather.
How much light does a Rex begonia need?
Rex begonia thrives in bright, indirect light. Direct midday sun can scorch the leaves. The ideal lux range is 2,000 - 10,000 lux. In practical terms, 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?
Toxic to cats and dogs if chewed. Keep Rex begonia out of reach of pets, or pick a non-toxic alternative like Air plant, Pink quill, or Spider plant.
Why are my Rex begonia’s leaves turning yellow or drooping?
On a Rex begonia, yellowing and soft growth usually mean overwatering — watch for yellowing leaves, mushy rhizome, or root rot. Let the soil dry further between waterings and check drainage. If you see crispy leaf edges, curling leaves, or faded leaf color instead, it’s likely thirsty — water a little more often. Botanicaly’s Plant Doctor can help assess visible signs from a photo and suggest possible causes.
Botanicaly
A schedule that reads your room.
You don’t need to work out your Rex begonia’s care from scratch each time. Botanicaly uses its saved setup and care history for the next step. Identifying is free. Pro adds Plant Doctor and Weather-smart care.
Still wet
Check again in 2 days
Botanicaly updates the next step when the soil isn’t dry.
