wrote in message

Last year we had trouble finding my favorite tomato seeds which was
the "Burpee Forth of July" hybrid. After eventually finding one pack
we had our usual tomato crop which was great and throughout the season
we saved our own seeds out of a few of these tomatos.

If "Burpee Fourth of July" is a hybrid then saving seeds from it won't give
you true offspring.

See Point 1 in:
http://plantanswers.tamu.edu/vegetables/seed.html