Answer: Use a good potting soil, such as Hyponex All-Purpose Potting Soil, or Professional Mix, which would be lighter and thus perhaps easier to use in hanging containers. Peat moss alone won't provide enough nutrients and structure. Feed with a fertilizer with the middle number (phosphorous) higher, such as Miracle-Gro, 15-30-15. Phosphorous promotes blooms. You can use the same soil, but it's a good idea to add some fresh to it. If you have any insect or disease problems, I'd use all fresh soil as they can overwinter. Good luck with your begonias!
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