Cross-pollination question on 2 acre property
I am growing only heirloom tomato varieties. This year I grew many varieties just see what would grow well here. Have it narrowed down to two cherry-type tomatoes and about 3 full-size varieties. My question is about the feasibility of growing 5 varieties within two acres. Will they cross-pollinate and cause unintentional hybrids? What about if I isolate each one from other varieties as much as possible, and separate them as much as possible distance-wise? There are no solid fences, they are all welded wire (open). I am hoping to plant a number of different varieties, but maybe its' not possible on such a small property?