I just put a cover crop mix in the test beds, it is actually a Fall cover crop, but what I had some of on hand to use. Three of the 4 seeds are the same as the spring mix, think they just also have a grass in the fall mix. Not sure what will go in there down the road. The soil seems pretty good to me, rich and lots of worms, that cover crop only took a couple days to start growing. I think there is Red Clover and Hairy Vetch in there that can come back and possibly spread - the bean and grass dies out and doesn't come back.
Well, if I had my way - I'd get rid of a lot of the larger trees, and build a sort of curved/angled sun trap about 175 feet wide (east/west) by a couple hundred feet deep (north/south), but there are a lot of mature trees - so, that would take some time or $ to really make happen. I'll have to be starting a little smaller in scale.
I have some seeds starting that I might put some in our garden by the house, and also up in the back area; Sorrel, Orach, Pole beans, leeks, asparagus, sage and thyme, several others just to start experimenting. I'll probably plant some of that around the test beds just so I can keep track of where I put things.