I live in Kansas City and have a cabin at Lake of the Ozarks. There is a large area by the road that I'd like to grow wildflowers that flower for the summer and self seed. The soil is terrible - very hard clay with a lot of rock (typical for this area). Because it is a get a way, there are periods that are very dry. To get things started, I can arrange to have watering done somewhat regularly. Oh, did I mention the somewhat steep grade. I am willing to bring in some good dirt, but would like to stay natural. Whacha think?