They mention the over harvest problem in the FAQ: "Do I need to leave some honey in the hive for the bees? Yes, this applies to all beekeeping. Your bees need

They mention the over harvest problem in the FAQ: "Do I need to leave some honey in the hive for the bees? Yes, this applies to all beekeeping. Your bees need honey to get them through the times when there is no nectar available. The number of frames of honey that you leave depends on your climate. You should consult local beekeepers as to how much they leave in their colonies over the winter. The Flow frames make it a lot easier to see how much honey is in your frames at any time, so you can learn to manage how much honey to harvest and how much to leave for the bees. Watching the honey level change every day is quite fascinating and I personally feel more in touch with the bees and can’t help but look on a daily basis. You can also take just a small amount of honey if you choose, by draining one frame or part of a frame."