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pleasing than a plank of wood). The holes need to be at least 10 and preferably 20cm deep, with a diameter of 4-8mm. Mind you, if you live in Leicestershire, drill holes 15mm across and you might get the massive carpenter bee, Xylocopa violacea.
biological reason for this.Honeybees, bumblebees and social wasps all congregate around prominent branches or treetops when they mate. Males gather together at these vantage points and mark them with a scent which then attracts females. These 'social' insects