Hello all. I am going to be gardening in a local community garden this year, and was wondering what kinds of vegetables might breed true without fears of cross-pollination/contamination? I was hoping to plant a few varieties of heirloom tomato (one cherry, one pear, and one slicing), two varieties of heirloom peppers (one sweet, one hot), eggplant, sunflower, cucumber, watermelon, broccoli, black-eye peas, sweet/snow peas, yellow squash and zucchini.

The plots are only 20'x20', and there will be about 30-40 of them in use, so physical isolation from other gardener's hybrid crops probably won't suffice. Do I have a chance of saving pure seeds from any of these species without resorting to bagging the flowers? Thanks!