Merging Two Queenright Colonies Safely
A step-by-step protocol for combining two established, queenright colonies into one strong hive using the newspaper method, without triggering fighting or queen loss.
Why Beekeepers Merge Established Colonies
Combining two queenright colonies is one of those beekeeping jobs that looks simple on paper and goes badly wrong if rushed. It is most often used to rescue a colony that has gone queenless late in the season with no time left to raise or introduce a new queen, to consolidate two weak colonies that would each struggle to survive winter alone into one that can, or to unite a nucleus containing a promising young queen with an older, larger colony whose queen is being retired. In every case the goal is the same: turn two populations that do not yet recognise each other as one family into a single cohesive colony without triggering the fighting that occurs when unrelated bees, and especially unrelated queens, are thrown together suddenly.
The core difficulty is that two queenright colonies each carry their own distinct pheromone signature, and worker bees are quick to identify and attack anything, including a rival queen, that smells wrong. Left to their own devices, two colonies pushed together will fight, workers will be killed, and one or both queens are likely to die in the chaos. A structured combining method exists to avoid exactly this outcome.
Choosing and Preparing the Queen to Keep
Before any physical combining happens, a decision has to be made about which queen survives the merge, and that decision should be made and acted on a day or so in advance rather than left to chance. The weaker, older, or less desirable queen is located and removed, leaving one of the two colonies temporarily queenless in the hours before the combine. Removing her ahead of time, rather than at the moment of combining, gives that colony a short period to begin missing her presence, which reduces the intensity of any defensive reaction when the two populations are finally brought together.
It is worth taking real care over this step, since a hastily conducted search that misses the queen can result in both queens surviving into the combined stack, virtually guaranteeing a fight between them regardless of how carefully the rest of the merge is executed. Brood and stores should also be roughly assessed at this stage, since a colony carrying disease, heavy pest loads, or very poor brood should not be combined with a strong, healthy one without first addressing the problem, or the healthy colony inherits it.
The Newspaper Method Step by Step
The classic and still most reliable technique places a single sheet of ordinary newspaper, or similarly thin, unwaxed paper, directly on top of the brood box of the queenright colony that is being kept. A few small slits are cut in the paper, just enough to let scent through and to give the bees a starting point to begin chewing without creating gaps large enough for immediate direct contact. The queenless box, containing the other former colony's bees and brood, is then placed directly on top of the paper, and the hive is closed up as normal.
Over the following one to three days, bees on both sides gradually chew through the paper, gaining a slow, gradual exposure to each other's scent as the barrier weakens. By the time direct contact happens, the pheromone signatures of the two groups have blended enough that the encounter is largely peaceful, whereas removing the barrier suddenly on day one would almost certainly provoke fighting. Reducing the hive entrance to a single, narrow opening during this period also helps prevent robbing and confusion while the merge settles.
Following Up After the Merge
A first inspection roughly five to seven days after combining confirms whether the merge has taken. By this point any remaining scraps of newspaper should be largely removed by the bees themselves, and the colony should show a single, calm population working normally with no dead bees or fighting evident at the entrance. Checking for a healthy laying pattern from the retained queen confirms she has survived the process and resumed normal activity.
Frames often need rearranging at this follow-up visit, consolidating brood together and moving excess empty comb to the outside or removing it if the combined colony does not yet need the space, since two colonies merged into one initially carry more frames than the resulting single unit can properly cover and defend. Timing also matters strategically: combines carried out in early autumn, well before the cluster forms for winter, give the merged colony time to settle into a stable structure before cold weather, whereas late, rushed autumn combines executed as a last resort carry a higher risk of the newly merged colony failing to organise itself before winter arrives.
Frequently Asked Questions
Do I need to find and cage the queen I am keeping before merging?
It is good practice to at least locate and confirm her presence and health beforehand, though she does not need to be caged for the newspaper method itself. What matters most is reliably finding and removing the other queen from the colony being combined away.
What happens if I miss the second queen during the merge?
If both queens remain present when the paper barrier is chewed through, the two queens are very likely to fight, and the colony may lose its queen entirely or end up with the weaker of the two surviving by chance. A careful, unhurried search before combining is the single most important step in the whole process.
How long does the newspaper barrier take to disappear?
Bees typically chew through a single sheet of ordinary newspaper within one to three days, depending on colony strength and how large the starting slits were cut. Checking after about a week confirms the merge has settled successfully.
Is it better to combine a weak colony with a strong one, or two weak colonies together?
Combining a weak colony into a strong, healthy one is usually the safer and more productive choice, since the strong colony's established workforce and queen carry the merge. Combining two weak colonies together can still leave the result under-resourced for winter, so it is worth honestly assessing whether either colony has an underlying health problem before deciding.