Answer: Begonia tubers are best started early, indoors, in trays of peat moss where the temperature, watering, and soil conditions can be controlled. After several weeks and when the soil outside is adequately warm, the tubers can be transplanted. Begonia tubers in the ground too early, especially if the soil is wet from rains or watering of other plants, can easily rot. Those that you have dug up and repotted should be placed where you can better control the watering (not sunk in the ground). Transplant them to the ground after you see lots of growth.
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