Alberto, Sinningia tubiflora may come from an area with a temperature range similar to that of San Diego as you state. But, from the annual rainfall amounts there are other differences. In the large pots they grow fine, flowering very well but, in order to achieve that I must water them all summer. Growing them in the ground would work but only of I arrange to irrigate them in summer. That's why I use pots. But, I may try planting some out one of these days. You are right on the tuber size. They are large and grow fast. Every few years I must unpot and split them up. It's really the same type of treatment I must give to alstroemerias, the Brazilian ones. These will bloom all year here if watered all year. The tropical alstroemerias are a bit more demanding on winter temperature, I find. Andrew San Diego