I found in my bulbs that you need them at least about inch and half in diameter to bloom , and you cannot force them, it is always in the end of winter, about end of March-start of April.
I also found, that in a local weather it seems the be better to keep them in the sun only during the morning (up to 11-12 .00) and then in the shade for the hot period of the day. Also you need to fertilize them a lot with mostly nitrogen rich fertilizer (I use Urea granules as fertilizer) .
