Johnny,
If you're thinking of drilling holes for orchard bees, I've found that they seem to prefer nests between 2-4ft above ground, with a variety of hole widths - from 5-9mm. Drill the holes to a depth of between 3 inches and 6 inches.
The smaller holes look too small, but they often seem to be the first to be used, despite the bees looking like they're too big to get into the hole!
Unused holes will provide homes for spiders, or winter shelter for ladybirds and the like. Sometimes solitary wasps will also nest in the holes, but there is very little risk of either the solitary bees, nor the solitary wasps attacking humans.
If you're thinking of drilling holes for orchard bees, I've found that they seem to prefer nests between 2-4ft above ground, with a variety of hole widths - from 5-9mm. Drill the holes to a depth of between 3 inches and 6 inches.
The smaller holes look too small, but they often seem to be the first to be used, despite the bees looking like they're too big to get into the hole!
Unused holes will provide homes for spiders, or winter shelter for ladybirds and the like. Sometimes solitary wasps will also nest in the holes, but there is very little risk of either the solitary bees, nor the solitary wasps attacking humans.
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