Ina asked, >I have some propagating sand to plant my Tecophilia bulbs, but it is >neutral. As Jane says, it needs to be acidic. Do I mix in some >sulphur? Flowers of Sulphur? No, do not bother to make your neutral sand more acidic. Neutral is fine. I merely mentioned the acidic nature of the substrate because I knew that there is limestone, and presumably lime soils, in parts of New Zealand where Ina lives. It is rare that plants from limestone areas require alkaline soils as long as you supply adequate fertilizer, but plants from acid soil areas sometimes respond badly to lime soils. The pH of the potting mix I used for almost all my bulbs for years was around 6. Jane McGary