You can see the sealed one in the photo below.
Hive reproduction
Swarming is the bees' way of creating more colonies. The queen and half of the bees leave the hive and go to find a new home. Meanwhile the original hive nurtures a new queen from one of the queen cells left behind before the original queen left.
It's hard to discourage bees from swarming once they get it into their heads. You can squash any queen cells you find (but you'd better find ALL of them!). You can give the bees more space. Sometimes this works.
But once they start making queen cells it is usually best to do for them artificially what they want to do in nature, ie split the colony into two.
Nucleus method
There are a number of methods of splitting hives that have been developed by beekeepers over the years. Some are highly complex. Some require you to return every few days for a couple of weeks.
The simplest method (and the one I can get my head around) is the "nucleus method". A nucleus is a small colony (usually of 3-6 frames). All this method involves is taking the original queen out of the hive and putting her in a nucleus box, along with two frames of brood, a frame of stores and plenty of nurse bees from the original colony.
This is doing a kind of swarm, artificially, before the bees do it themselves and end up in a tree. The queen leaves the hive with half of the bees. The remaining hive detects that she has gone and raises a new queen. It's simple. It has its limitations, but last year it worked well for us. So I expect that is what we'll be doing again this year to a number of our hives.
Of course this does mean you can potentially double your number of hives. If this is an issue (and it probably will be for us - we do not have unlimited space or time!) you can "unite" the two colonies back again after the swarming season is over, keeping just one of the queens (probably the younger one).




