At the end of the season, identify your begonia before choosing winter care. Tuberous begonias can be stored dormant, while many wax, cane and foliage begonias are kept as living indoor plants. Treating every begonia as a dry tuber can kill plants that need to remain in growth.
Check the label and the plant’s condition
Look for the botanical name, cultivar or original nursery description. Large flowers alone are not enough to identify the root type. If the label is missing, photograph the leaves, stems and whole plant and ask the nursery for help before digging or cutting it apart.
Decide which plants are worth saving. Keep healthy specimens you have space to manage; do not move a heavily infested plant directly among indoor plants. Remove fallen debris and inspect leaf undersides, stem joints and the container before bringing anything inside.
Store tender tuberous begonias frost-free
As growth finishes and foliage yellows, reduce watering. Lift tender tubers before frost and let them dry under cover, handling them gently. Remove loose dead material rather than pulling at living tissue. Label the tubers so you can match them with their flowers next year.
The RHS outdoor begonia guide recommends frost-free storage, ideally around 7°C (45°F), in barely moist storage material. Inspect periodically for decay or excessive shriveling. A damp sealed bag and a freezing shed are unsuitable substitutes for controlled storage.
Do not add water on a fixed weekly schedule to dormant tubers. Their storage condition matters more than the calendar. Separate any deteriorating tuber and seek advice if the problem spreads; routine fungicide treatment is not a required step for every healthy plant.
Keep wax, cane and foliage begonias as plants
Many fibrous-rooted and rhizomatous begonias can remain potted indoors with appropriate light and warmth. They should not all be dried, stripped of roots and put away in darkness. Iowa State’s guide to begonia types helps distinguish wax, cane, rex and tuberous forms.
Choose a suitable bright position and a pot with drainage. Check the mix before watering and empty standing water from the saucer. Indoor winter growth may slow, so do not carry the outdoor watering and feeding schedule indoors unchanged. Watch for pests and remove damaged leaves as needed.
Use the right propagation method
Saving a healthy cutting may take less space than keeping a large plant. Stem cuttings suit some begonias; leaf propagation suits certain foliage types. Root division is not a universal method for the genus. Identify the plant and use instructions for that type before removing material.
Hardy begonias, including forms sold as Begonia grandis, require their own local hardiness assessment. Do not transfer that description to ordinary tender bedding begonias. Mulch cannot guarantee survival outside a plant’s suitable winter conditions.
Restart gradually in spring
Inspect stored tubers before potting and restarting growth indoors. Give living indoor plants suitable light and resume care according to their growth. Move plants outdoors only when conditions are appropriate for that type and frost risk has passed, acclimating them gradually rather than moving straight into exposed sun.
If you choose not to overwinter a plant, compost healthy material where appropriate or use your local garden-waste service. Handle diseased or infested material according to local advice. Saving every plant is optional; using the correct method for the ones you keep is what matters.
