This species is one that seems to really prefer growing near
concrete, limestone gravel, or on heavily-limed yards. (They love calcium.) For natural cultivation, in "Mycelium Running",
Paul Stamets suggests: "innoculation of spawn directly into manure-enriched soils or 4- to 6-inch-deep beds of hardwood sawdust. Newly laid or fertilized lawns are perfect habitats for shaggy mane. Cow or horse manure, mixed with
straw or sawdust, is also ideal." I always dump blackened shaggys into my
compost pile or make spore emulsion and pore it onto limestone gravel piles. Liming your yard would probably encourage them, as well as watering your lawn with non-chlorinated
water during dry spells in the late summer. Good luck!