lindakd - i'm kind of between isle and mora. on the same road as k&r custom meats. love the area. You nailed the issues w/ doing food plots up there. i have the same things: rocks, roots, clay, etc. overall, things grow well though as long as we get rain. i've had good luck w/ oats, clover (probably my best luck), and rape. i'm thinking about beans and more brassicas this year.
i'd have a planter already but it's just AMAZING how expensive they are. can't find a good deal.