Bees resting on sedum flower

Q: Bees seem to be drunk and asleep when viewed on flowers. Can insecticides cause this? 

A: More than likely, the bees are sleeping! Bees of all kinds are well-known to rest on flowers, particularly near dusk or when it’s chilly. I see them on my backyard sedum plants. Some entomologists theorize that most of the resting bees are males who have no hive to return to at night.