Minecraft wiki entry for Honey_farming, associated text: As of Java Edition 1.15.2, occupied bee nests additionally have a 5% chance to spawn on oak or birch trees in any biome that were grown from saplings within two blocks of any flower at the same y-level. With a bit of luck and a large enough supply of oak or birch saplings and bone meal, one can obtain bees relatively easily without having to travel, by repeatedly growing trees near flowers until one spawns a bee nest as it grows. This is also an ideal way to obtain bees in older worlds created prior to Java Edition 1.15, as it saves players from having to locate anything.