Tim Kostamo wrote: The soil is not great, sand/gravel/clay, thin forest soil layer of good stuff.
The joys of living where the last Ice Age redistributed all sorts of stuff, except good topsoil!
I've been improving my soil in places with a mix of portable chicken
shelters, home-made biochar (made out of
wood that's a fire risk), small Hugel mounds, and just planting anything that will leave
roots in the soil.
I'm a bit surprised that your area is rated 9A. I'm across the water on the south end of the Big Island, and particularly with some of the cold snaps we've been having lately, I'm really looking at trying to develop some heat traps that can be semi-enclosed to help with weather like we had in Jan. of this year, when we had two nights at -10C in a row.