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"It also goes without saying that in order to maintain seed purity, you shouldn't grow tomatoes of differing varieties close to each other. "
I have 2-each of six different heirloom tomatoes, all spaced fairly close together . . so it sounds like i cant successfully save the seed? How far apart are we talking?
The book "Seed to Seed" references the exact numbers. They would be something like 6 to 10 feet apart for tomatoes, but for safety's sake I'd give them 25 feet.