I don’t know about forcing them indoors, but I have read that they need 6 weeks of “cool” temps to initiate flowering. I’m guessing it doesn’t need to be very cold, as mine bloom after being outside all winter here. My temps are on the warm side in So CA zone 10a. I only get a light frost a few times a year. I think you would need grow lights to get them to bloom after the chilling period. Hope this helps a little:). Lisa