Leo wrote: >I would recommend you try what I presume is your local fine-particle >desert or grassland soil. Your winters are generally of low humidity >unless it's raining, right? Jerusalem winter can be 50% to 70% mean relative humidity. Summer is 30% to 50% depending on time of day. We are about 800 meters high and oftren strrong day night contrast.. I don't know if this is called low humidity. I am not in real desert, more like chapparal. Our soil is a clay loam from a limestone base. There is a low organic sandy soil from the lowlands that I really love and use straight for Baja California or Karoo plants that may be sensitive. Never tried it on bulbs except for some Atacama plants. Too early to tell results. Shmuel