Years ago ( don't think I could duplicate the amount of work now!) I had truckloads of topsoil brought in and did raised beds to combat the heavy clay here. They are all raised anywhere from about 6" to a foot in height. I learned after the first truckload that pure topsoil is terribly heavy,as I nearly ruined my back hauling the wheelbarrow back and forth. After that, I had the garden center custom mix me a blend of 2/3 topsoil and 1/3 "soil conditioner" ( a mix of old organic mulches - hardwood, pinebark, cypress, etc.) That makes the perfect loamy soil. ) It is a lot of work initially - I dug up my entire garden and then replanted EVERYTHING but the improved soil was worth it. I now add compost and soil conditioner periodically and always amend when adding new plants.
Good luck!
