NW Florida... do you have sandy soil?
I think of Mushroom compost as a really good addition to in-ground garden bed. Good ones have no weed seeds so I incorporate in to tope layers. I tend to sheet mulch so I fill the lower layers with unfinished compost, bulky stuff like rotting woodpile branches and pulled weeds, hay, turned over sod, weedy soil, etc. as well as mineral amendments like lime, rock phosphate, greensand, etc. then put down layers of paper then top with weed-free bagged top soil, garden soil, mushroom compost, sand, used coffee grounds... top with mulch like grass clippings, leaves, straw, wood shavings, etc.
What are you thinking of growing?