After your Double Camelia White Begonias have finished blooming, it's essential to provide proper care to ensure they return in future seasons. Gradually reduce watering as the foliage starts to yellow and wither.
Once it has completely died back, carefully dig up the bulbs and clean off any remaining soil. Allow them to dry for a few days in a well-ventilated area before storing them in a cool, dry, and dark place. Use a breathable container, like a mesh bag or cardboard box, and store them at a temperature of 40-50°F. Inspect the bulbs periodically for any signs of rot or pests.
Begonias are hardy in USDA hardiness zone 9 and up, so if you live within one of these zones, you can leave the begonia bulbs outside in the ground.