Hello, all Some time ago someone referred to a previous discussion years ago (possibly through IBS?)concerning Osmocote and similar slow release fertilizers. I have been unable to find it in the archives. Can anyone recall the date or answer the question that the brief mention tantalized me with: what did the research indicate about heat and it's effect on this type of fertilizer? If this rather garbled message rings a bell for anyone, please let me know. I need to fertilize some bulbs. Thanks, Kathy S. It's rained 9 inches here since Sunday. Daffodils are starting to bloom as are Iris reticulata. Zone 8/9, Sierra foothills, Northern California, wet in winter, very dry and hot in summer.