OK then... I should just leave the new beds, that wrap the house as sandy soil. I would think that a peat or humus would add nutrients.
I do have a small composter in my yard.. it's the kind with the base to collect the "tea" - so i guess I could add a scoop or two when I put plants into the ground.
here is the other flower bed... the one under the window faces south, gets a lot more sun, the other -- where you can see the downspout - I plan to put a rain barrel, but I'm still searching.... that bed is more narrow, so maybe I'll look for a flowering ground cover or leave it just mulched.