preserving heritage tomatoes
I have been given some Heritage tomato seeds - Peacevine. They have germinated and are now ready for planting out.
Assuming I am successful in getting them to flower and fruit, I'd like to save the seeds for next year, and maybe pass them on to friends, to keep the variety going.
I have also sown some Brandywine and Sungold, which I was intending to raise in the same bed.
Do I need to be worried about the Peacevine cross-pollinating with the other two to produce a hybrid, or will the fruits and seeds come 'true'? If there is a risk of cross-pollinisation, what is the best way to prevent it, if that's possible?