Peter, any occasional heavy rainfall would be lost in the scree slopes it grows in. The pattern is a long dry winter, late spring rainfall till the beginning of fall then drought again. It seems there is a winter growing /summer dormant Paramogaia in cultivation in the US as well and I have seen it at the fabulous collection of the UC Irvine Arboretum in flower at late winter. This is intriguing as there is not in Peru any area with winter rainfall. Given how impressive the plant is it is comparatively easy to grow of course following basic guidelines and drainage is a must. It makes big bulbs and offset regularly.