Busy Bees

For weeks I have been marvelling at the amount of bees in my garden. Bees are good. It turns out my neighbour has a bees nest in his garden. So did the bees nest there intentionally because of my garden as a pollen source or do I simply have lots of bees because they've nested there? Anyone? Either way because they keep dive bombing my neighbour on their way to my flowers, he's having it removed. Here's hoping more bees move in.