As Cym Ladye stated these are tricky; I have a few in my collection and her advice is spot on; warm and wet from mid spring (mid April) to about the end of September. Then drastically reduce watering, and increase both shade and air circulation; I maybe water twice a month from October to February, and never so much as to have the media get thoroughly wet--think of it more as a 5 minute light rain--ie if you were walking about outdoors you'd need neither an umbrella nor a slicker--the top 1/4" of soil would get wet, but that's about all. If you're in a cold greenhouse, just stick them under a bench of resting plants. About Valentine's Day, you should see spikes breaking the media about 1/4" from the bulbs; at this time give them a bit more light, but do not water. When the spike is 1-2" long and the bud has begun to swell, give them a light watering; they should bloom out by mid March. Slugs especially love the forming spike, so watch out for them.
Good luck!
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