Answer: Tuberous begonias are summer flowering plants that go into dormancy after their spectacular bloom period. So technically, you can grow them indoors, but realistically, they will be dormant during the fall and winter months. Enjoy your plants while they're at their best. In the late summer and early fall, when the leaves begin to yellow, water less frequently. When the stems begin to wither, withold water all together. The stems will fall off on their own, which is your signal to dig up the tubers and allow them to rest in a cool, dark, airy location. When they sprout new little bulbs you can repot them, placing them just 2" below the surface of the potting soil. Water regularly, stand back, and enjoy their performance for another season. Then in the autumn, repeat the above steps.
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