Don, If you're not sure that you can isolate your Black Aztec corn from your neighbors' corn pollen by distance (a few miles) or by tassel & pollen shed timing, whether theirs is GMO or hybrid or even a different open-pollinated heirloom variety, then you could consider hand pollinating the portion of corn you want to save by bagging it. Here is a link to a website with good pictures of the process: http://www.chaseiowa.com/webfiles/Instructions.pdf A good book about saving seed of corn and other heirloom vegetables is Seed to Seed by Suzanne Ashworth. Renee Pereault If you would like to access previous postings to the Mich-Organic listserv you can copy and paste the following URL into your browser address bar http://list.msu.edu/archives/mich-organic.html