I have started 25 types of heirloom tomatoes and need to know far apart I haveto plant them to keep from crosspolination
Post your question on the Tomato Forum instead of this one, and you will likely get answers. Or search in that forum with the key words "spacing" or "cross-pollination" and you will see past threads on the same question. I won't pretend to be an expert myself but at lease I can direct you to where I have rec'd the best and quickest advice. Good luck!