According to the Adubon society: Eastern sand wasps depend on nectar and larva eat various kinds of flies. Attracting these guys have not been difficult, merely by planting the flowers they like, such as Sweet clover can attract these guys to the garden.
And drone flies.
I learned that this type of spyder depends on dense shrubbery plants or in my case, lots of sunflower habitat to make their homes in, which of
course the garden grew thick with this year, excellent pest control Ehh?