David.....thank you for the service to our country.
It sounds like you share a real passion for gardening with several of us. When I buy soil amendments I also choose Home Depot. I have clay and rocks and always need to use a pick to dig a hole. I add course organic matter to my soil and iris grow well here. That is a continuing chore as the soil 'digests' the compost. What zone are you in? If you can grow tomatoes iris should thrive. The areas where I used to plant tomatoes are full of iris now so I planted tomatoes this year at my sons. He lives across the street. I had my last tomato for the year on a sandwich yesterday and will miss them. Fall clean-up is now my gardening activity and that oh so long winter. Each day iris bloom season is a little closer.
Hollywood Star....one of my favorites.