Bee nuts, I only add the supers one at a time and I wait until the bees have filled at least half of the super below, and have started to cap some of the frames. I'm hoping they are all full, except the top super, and I looked at that yesterday when I took the pictures, and the bees are really getting after that one too.
These bees are on an alfalfa, hay fields that run for several hundred acres. It also has a little spring fed creek just behind the hives. It's the best bee yard I have, of the 5 locations. I'm going to put more hives here next year, I built the stands for them as you can see the empty one in front of the hives. Just hope the bears don't find the honey before I get it.