I understand the procedure to combine 2 hives, but what if you wanted to add frames of bees/brood to strengthen a weak hive?
You can do that. It is a great way to strengthen a hive.
Would the new hive accept a frame of bees, or would this only cause chaos?
The newly hatch bees ar automatically accepted.
I'm just thinking about this because my neighbor has been telling me about a tree that seems to have thrown 2 small swarms already. Apparently the swarms were only baseball to softball sized. It's hard to beleive such a small swarm can survive.
You would be amazed. They will probably do fine. Put them in a nuc box. Watch them grow.