You may notice clusters of small holes and/or mounds in patches of open ground this spring. Don’t be alarmed! They may be homes to ground bees, who mate during March to May and burrow approximately 6 inches into the earth to lay an egg. The clusters of holes may be unsightly, but ground bees are useful pollinators and should not be controlled unless absolutely necessary. Their colonies also help aerate the soil and are not harmful to plants or people.