Ken Kehl is right in most regards. The only quibble I might have is over the forms of nitrogen. Nitrite is not generally available, as far as I'm aware. The choices are usually between ammonia-based nitrogen (including urea) and nitrate based nitrogen, especially as potassium nitrate and calcium nitrate. For bulbs, the nitrate is preferable to the ammonia based, since fungi can use ammonia nitrogen more readily than nitrates, and vice versa for plants -- nitrate is the preferred form for most plants under many conditions. If you flush your pots occasionally with plain water, you will have a tough time generating fertilizer burn. The salts in soluble fertilizers are just that -- soluble. They dissolve and wash away when the pot is flooded. Using granular slow release fertilizers is an entirely different situation. I can't offer any advice on using such, because I absolutely refuse to do it. I put "organic" plant foods in the same banned category but for different reasons: Adding nutritious organic matter to bulb pots can encourage the growth of fungi and bacteria, which in turn can be the death warrant for delicate bulbs being grown far from their native haunts. Regards and good growing! Jim Shields in central Indiana (USA) ************************************************* Jim Shields USDA Zone 5 Shields Gardens, Ltd. P.O. Box 92 WWW: http://www.shieldsgardens.com/ Westfield, Indiana 46074, USA Tel. +1-317-896-3925 Member of INTERNATIONAL CLIVIA CO-OP