One of my friends has a tuberous begonia which has been in the same hanging basket without repotting for years. When in growth she waters it with the rinsing water from an empty milk bottle. And that is all. It flowers profusely every year. Ina Crossley Auckland New Zealand Zone 10 On 6/05/2013 5:34 a.m., Hannon wrote: > However, for the hobbyist > growing in pots the best way to keep bulbs or tubers in dormancy is to > leave them in their original soil and containers.