Native bees need lighter, sandy soils for their underground nests. These usual have more sparse cover. Wet or clay soils can be too dense. Foraging area extends 300 feet out from nesting sites.
(Implementation details: Detailed soil surveys are a base GIS dataset. Appropriate soils are defined in the range of loamy sand to sandy to sandy loam. This is the "nesting" layer. Foraging bees will travel ~300 feet from their nests. This requires growing the "nesting" layer by 300 feet in all directions to create "foraging". Together, these form the "sandy soil" layer.)