Homemade Yeast in Western PA

I planted buckwheat this year because I'd heard it was really easy to grow in virgin soils (it is) and it was a prolific producer of grain that could be turned into flour for use in breads and pancakes.  I thought it'd be cool to be able to make bread using flour that you had grown yourself.  For the ultimate in do-it-yourselfdom I wondered if it was possible to make your own yeast, that way you could make bread that was sourced entirely from stuff you made.  I remember looking up 'homemade yeast' on the interwebs and finding some pages that talked about the white powdery stuff on the stems of wild raspberry being a wild yeast and how you could take a stem of that and stick it in a bowl of flour and water and a 'yeast starter' could be made that way.  That sounded a little weird to me and I kinna stopped reading about it at that point.  Then we heard a bit about baking bread with homemade yeast on the Splendid Table podcast and it sounded super-cool.  Here's a link to that site which does an awesome job laying out how to make your own yeast, step-by-step.

http://splendidtable.publicradio.org/listings/101002/lost-art-of-bread.shtml