From what I have read and try to stick to this is.To keep a heirloom (tom) from X pollinating is to keep them 20 ft apart.This yr I wont be able to do this as I now have 11 verities.
Have you heard of putting a nylon over the blossen and as soon as it sets fruit you can take it off,then mark it as this will be your seed tom.
I need to find out something. I sure don't want lose the ones I have.
If you know of another way let me know.
Thanks Don in Ca.