I admire your optimism for shared hives. I have experienced it go wrong. I am not saying 'no!'. I am saying, 'please think about how you are going to work together'.
Totally ... my idea was that two or three novices SHOULD ALWAYS work together, plan together and share all the early experiences of beekeeping, good and bad. .
I was sharing a hive (many years ago) with two other novice bee keepers. The experienced bee keeper had moved away and we had just been told - get rid of any queen cells. Unfortunately, that advice had been given early in the season.
Something that should not have happened ... a replacement 'mentor' needed to be in place
One of our number took it upon herself to do a queen-cell eradication on a hive late in the season that we realised subsequently had become queenless. In retrospect, the queen cells seemed to be of the emergency variety. Now that could happen with any newbee, but because we were not all together each time the hive was opened each of us only saw part of the evidence. For instance, one person noticed that on their visit the bees were not happy. The next person saw queen cells and destroyed them. On subsequent visits no brood were seen. On my final visit I found that the whole hive had been covered in insecticide powder. (We had no mentor present to help.) Worse still, it was in the earlier days of varroa, when that was seen as an automatic death sentence for a hive.
Recipe for a disaster !
My advice would be, if you are going to share a hive make sure you have a mentor who can point out what is happening. Ideally, all be present at all openings of the hive. If you cannot all be present at each opening, ensure that you have common aims and objectives, e.g. you do not have one person trying to raise queen cells while another is ensuring that there are no queen cells. If you are going to destroy the colony, let the others know. Communication is key. Don't let my bad experience put you off... hopefully it will help you.
Absolutely excellent post event assessment and recommendations.
Fortunately, that early experience did not put me off, I was just waiting to get a plot of land to inflict my own individual madness on the poor bees. I would call them 'MY bees', but everyone knows that bees only belong to themselves.
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