tvrchimaera wrote:

Can peppers be grown from supermarket pepper seeds??

Most likely yes, but you won't know the variety, whether it's a hybrid that
won't breed true, or how it will do in your locale.
Seeds are cheap; land and time are not.

Just my opinion...
Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic
Zone 5/6 in upstate New York, 1420' elevation. NY WO G