Rex Begonia
Begonia Rex
Rex Begonia, also known as Painted-leaf Begonia, is cherished for its vibrant foliage and unique leaf patterns. Native to tropical regions, it thrives indoors and adds a touch of elegance to any space.
Everything it needs
9 essentials at a glance
Watering
Rex Begonias prefer consistently moist soil but should not be waterlogged.
Water when the top inch of soil feels dry, typically every 5-7 days. In the winter, reduce watering frequency to every 10-14 days. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaf wilting and crispy edges.
Light
Rex Begonias thrive in bright, indirect light but can tolerate partial shade.
Avoid direct sunlight, which can scorch their leaves. Ideally, they should receive 10-12 hours of filtered light daily, and they can tolerate light levels as low as 4 hours but may lose vibrancy.
Soil
Use a well-draining potting mix, ideally a blend of peat moss, perlite, and pine bark.
The ideal pH range is between 5.5 and 6.5. Ensure the pot has drainage holes to prevent water accumulation, which can lead to root rot.
Humidity
Rex Begonias prefer high humidity levels, ideally between 50-70%.
Increase humidity by misting the leaves, using a pebble tray with water, or placing a humidifier nearby. Signs of low humidity include leaf curling and browning tips.
Temperature
The ideal temperature range for Rex Begonias is 65-75°F (18-24°C).
They are not frost-tolerant and should be kept above 60°F (15°C). They thrive in USDA hardiness zones 10-11, and temperatures below 50°F (10°C) can cause stress.
Fertilizing
Use a balanced, water-soluble fertilizer with an NPK ratio of 20-20-20.
Fertilize every 4-6 weeks during the growing season (spring and summer) and reduce to once every 8 weeks in fall and winter. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Rex Begonias in early spring to remove any dead or damaged leaves and to encourage bushier growth.
Use clean, sharp scissors or pruning shears. Deadheading is not necessary, but removing spent leaves can improve overall appearance.
Repotting
Repot Rex Begonias every 1-2 years or when they outgrow their pot.
Choose a pot that is 1-2 inches larger in diameter. Signs that repotting is needed include roots growing out of the drainage holes and stunted growth. Carefully remove the plant from its pot, gently loosen the roots, and place it in fresh potting mix.
Propagation
Rex Begonias can be propagated through leaf cuttings or division.
For leaf cuttings, select a healthy leaf, cut it into sections, and place them in moist potting mix. Keep the cuttings in a warm, humid environment until roots develop, typically taking 4-6 weeks. Division can be done during repotting, ensuring each division has roots.
When it's unhappy
Yellow leaves
Why it happens
This can be caused by over-watering, poor drainage, or nutrient deficiency.
How to fix it
Adjust watering habits, ensure proper drainage, and consider fertilizing if nutrient deficiency is suspected.
Leaf curling
Why it happens
Leaf curling can occur due to low humidity or inconsistent watering.
How to fix it
Increase humidity levels and maintain consistent watering to prevent stress.
Brown leaf edges
Why it happens
This is often a sign of low humidity or underwatering.
How to fix it
Mist the leaves regularly and check the soil moisture to ensure adequate watering.
Root rot
Why it happens
Root rot is typically caused by over-watering and poor drainage.
How to fix it
Reduce watering frequency, ensure the pot has drainage holes, and consider repotting into fresh soil.
Pests (e.g., aphids, spider mites)
Why it happens
Pests can infest Rex Begonias, especially in dry conditions.
How to fix it
Inspect regularly and treat infestations with insecticidal soap or neem oil.
Care through the year
Spring
In spring, increase watering and resume regular fertilization as the plant enters its active growth phase. Prune any dead leaves to encourage new growth.
Summer
During summer, ensure the plant receives bright, indirect light and maintain high humidity levels. Water regularly to keep the soil consistently moist.
Fall
In fall, gradually reduce watering as the plant's growth slows down. Continue to monitor humidity levels and prepare for the winter months.
Winter
In winter, reduce watering to every 10-14 days and avoid fertilizing. Keep the plant in a warm location and maintain humidity to prevent stress.
Toxicity & Safety
Rex Begonias are mildly toxic if ingested. Symptoms of ingestion may include nausea and vomiting in pets (cats and dogs) and children. The leaves and stems are the most toxic parts.
Good to know
Why are my Rex Begonia leaves turning yellow?
Yellowing leaves on a Rex Begonia can indicate over-watering or a nutrient deficiency. Check the soil moisture and consider fertilizing if needed.
How often should I water my Rex Begonia?
Water your Rex Begonia when the top inch of soil feels dry, typically every 5-7 days. Adjust frequency based on seasonal changes.
What light conditions are best for Rex Begonias?
Rex Begonias thrive in bright, indirect light. Avoid direct sunlight, which can scorch their leaves, and aim for 10-12 hours of filtered light daily.
How can I increase humidity for my Rex Begonia?
Increase humidity by misting the leaves, using a pebble tray with water, or placing a humidifier nearby to create a more favorable environment.
When should I repot my Rex Begonia?
Repot your Rex Begonia every 1-2 years or when you notice roots growing out of the drainage holes. Choose a pot that is 1-2 inches larger.
Is Rex Begonia toxic to pets?
Yes, Rex Begonias are mildly toxic if ingested, particularly the leaves and stems. Symptoms may include nausea and vomiting in pets and children.
How do I propagate my Rex Begonia?
You can propagate Rex Begonias through leaf cuttings or division. For leaf cuttings, place healthy leaf sections in moist potting mix and keep warm until roots develop.
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