Hans, you are right: Lapiedra is quite anundant here is Spain. They grow in different soils: they love "terra rossa" coming from descomposition of calcareous rocks but also is abundant in sandstone soils. But they prefer the stony side, growing happily inside crevices. So one of the most important things is that they should never get too wet as they enviroment, even with heaviest storms, gets dried very quickly. An almost totally dry dormant season during summer is crucial, with only some ocasional watering to avoid bulbs getting too dessicated. Begin watering in autumm, but keep it always on the dry side. Mine do well, and as they are grown in a pot outside, the best thing I can do is almost leaving them alone and let nature work with only some occasional watering because of their "potted way of life". Good luck!
