Brenda Groth wrote:I am a firm believer that if you have land and you can deal with doing it you should plant as much food as possible not only for yourself, your family and friends but to give or sell and also for all of the wildlife..someday we might need to live off of all that wildlife so they better be well fed.
That is a great way to look at things. I feel the same way. However what you are trying to do is push the zones. What I would do is look for the most northern example of the plant you want. Provenance is everything. A good example is black walnut. I've run across two examples that have made it through 20 years of -40C weather. The trees put everything they have into vigor and have the tiniest nuts you've ever seen but you know what? The seeds are viable. You can plant them in the ground and get a sapling from them. Your hunt will be that of a treasure hunter. You need to find the most northern sourcing of the plants you want. What you may not get is the preferred "cultivar" selection.
And who knows, you might learn something odd about your specific region that allows you to skirt zones. Here, it is dogwood country. You plant it and it will grow, usually double the size of what the label says. The conditions are so slanted in favour of dogwoods one grower is planting species 3-4 zones out and getting success. Sure there is dieback but the plants grow so quickly during the warm season they more than make up for frost damage. One of my longer term projects is to get the space to try the edible European varieties of dogwood.
So if I could get either medicinal or fruiting value from dogwoods I'd be off the to races.
I think if you are persistent, you are only a zone and a half out from pawpaws that you could get away with something in a sheltered location. There might be other factors involved like moisture and fungal requirements that your mid west soils aren't giving them. I learned that the hard way with maples. Outside Norway and Boxelder, the water table is too low to support them. You might have a similar condition happening.