During the bloom each season, commercial apple growers usually provide pollinators to carry the pollen. Honeybee hives are most commonly used in the United States, and arrangements may be made with a commercial beekeeper who supply hives for a fee. Honeybees of the genus "Apis" are the most common pollinator for apple trees, although members of the genera "Andrena", "Bombus", "Halictus", and "Osmia" pollinate apple trees in the wild. Solitary bees or wild bees such as ground-nesting mining bees ("Andrena") may play a far bigger role in pollination than at one time suspected, and are alternative pollinators in orchards. Bumble bees are sometimes present in orchards, but not usually in enough quantity to be significant pollinators; in the home garden with only a few trees, their role may be much greater. Apple growers also rely on several species of wild bees for pollination in their orchard.