Last year, I had a hive that overwintered in 2 deeps. When both deeps were being used, more or less, by the bees, I gave them a third one, with 10 frames of wired wax foundation. I thought that this would give them plenty of extra space and discouraged swarming. But they ignored the new frames entirely - didn't draw them out one bit, and made swarm preparations instead. This year, I ran into a similar situation - one of my overwintered hives was getting ready to swarm. Eggs were gone, open brood was few and far between, and there were several capped queen cells. I took out every frame with a queen cell, plus a couple more, and made a nuc (which worked - that nuc raised a queen from one of the cells and is in good shape going into winter). I replaced the frames that I took out with 5 frames of wired wax foundation. For the rest of the season, the bees ignored those frames utterly. They started raising brood again, grew in population, and eventually swarmed anyway. Meanwhile, the foundation remained undrawn. Do undrawn frames simply not work to give the bees "extra room" and discourage swarming? Is there something different I can do to encourage the bees to use such frames in their brood chamber? Or does introducing frames with foundation only work for a 1st year hive that's growing in size from a nuc or package? Thanks.