Troubleshooting
Beefsteak Begonia problems — and how to fix them
Beefsteak Begonia (Begonia erythrophylla) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Rhizome and root rot
Overwatering or poor drainage rots the succulent rhizome, the most common way this plant is killed. Let the top inch dry out, use a gritty mix, and never let the pot stand in water.
Powdery mildew
Begonias are prone to a white powdery coating on leaves in stagnant, humid air. Improve airflow, avoid wetting the foliage, and remove affected leaves promptly.
Leaf scorch and fading
Direct sun bleaches the green and washes out the red undersides. Move to bright indirect light to restore the contrast.
Leggy, sparse growth
Too little light stretches the petioles and spaces leaves out. Brighten the location and pinch back to encourage denser rhizome branching.
Mealybugs and spider mites
Watch leaf joints and undersides for cottony mealybugs or fine webbing from spider mites. Wipe off and treat with insecticidal soap or neem.
Winter leaf drop / dormancy
Some lower-leaf loss and slowed growth in winter is normal. Cut back on water and feed, and resume normal care as light returns in spring.
Prevent beefsteak begonia problems before they start
Most beefsteak begonia issues are care-mismatch, not bad luck. Dial in the basics:
Beefsteak Begonia problems — FAQ
Why is my beefsteak begonia rhizome and root rot?
Overwatering or poor drainage rots the succulent rhizome, the most common way this plant is killed. Let the top inch dry out, use a gritty mix, and never let the pot stand in water.
Why is my beefsteak begonia powdery mildew?
Begonias are prone to a white powdery coating on leaves in stagnant, humid air. Improve airflow, avoid wetting the foliage, and remove affected leaves promptly.
Why is my beefsteak begonia leaf scorch and fading?
Direct sun bleaches the green and washes out the red undersides. Move to bright indirect light to restore the contrast.
Why is my beefsteak begonia leggy, sparse growth?
Too little light stretches the petioles and spaces leaves out. Brighten the location and pinch back to encourage denser rhizome branching.
Why is my beefsteak begonia mealybugs and spider mites?
Watch leaf joints and undersides for cottony mealybugs or fine webbing from spider mites. Wipe off and treat with insecticidal soap or neem.
Why is my beefsteak begonia winter leaf drop / dormancy?
Some lower-leaf loss and slowed growth in winter is normal. Cut back on water and feed, and resume normal care as light returns in spring.