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Nature's most important thing is reproduction. It is meaning of life. In bees it is called swarming.
Non swarming hive is a result of human selection, and it is againts nature's meaning.
From bulls and bigs a man cuts balls. That is human meaning.
So, what you do, when after one year's work 2 swarms leave and take with them the year's yield.
I cut the queen's wint and inspect every week to see, are they doing queen cells. If they have queen cells, I make AS with foundations.
Another way is to get non swarming bee strain. It is behind hard work and closed mating will soon suddenly give harms of inbreeding. I have had such but it is difficult way in small yard.
I have noticed better way to accept swarming, clipping and AS. It is better than try to keep unswarming genepool in small yard.
But there are big differencies inside´term "swarming". They are between mad and acceptable.
Even those who have non swarming beestock, they inspect the hives every week. At same time they look, does hive has honey to extract, does it need more space to nectar, space to bees, and so on.
I have a friend who does nothing. He picks swarms from lilac busch swarm after swarm, and that is his system. That level is enough to him.
Is any easy way to avoid swarming? With my 53 years experience the answer is NO. But you nurse your hive 12 months in a year and then you let them go. That is the most expencive way to keep bees.
To add space to the hive is nothing swarming preventing method. Forget it. It is not that easy.
.When the natural hive is rippen to swarm, it swarms. Nature calls. Big and best colonies first.