Tomato (by special request) ;)

Garden tomatoes belong to the Genus Lycopersicon, and the species Lycopersicum. There are conflicting reports about the cross-pollinating of tomatoes. Some claim that crossing is rampant, others claim to have never seen any indication of it. Tomatoes are "inbreeding" plants whose flowers (in most garden cultivated types) have retracted styles (the part of a flower receptive to pollen). This type of flower structure will severely limit any cross pollination, and may actually preclude crossing from happening naturally. Check the blooms of your tomato plants to see that the anthers extend above the style (the pollen pod is closest to the opening of the flower, and the part that receives the pollen is very deep into the flower structure). The one known exception is if a double bloom or fruit is found on a Beefsteak variety. Single fruits are fine, but do not save seed from double bloom or double fruited Beefsteak tomatoes.

Seed from paste and slicing tomatoes can be saved and the rest of the fruit eaten or processed as otherwise usual. You know where the seeds are, separate the seed and gel from the fruit into a bowl, add an equal volume of water (ie 1 cup of water for every cup of seed and gel mixture) set this mixture someplace where it can ferment (use a bowl that you will not use for food again) Allow a layer of mold to completely cover the mixture. It takes about three days for this to happen, add more water (about double what is there and stir vigorously. Let this stand for a few minutes (good seeds will settle to the bottom) pour off the mixture, keeping the good seeds in the bowl. Add about the same amount of water, stir, settle and pour off the trash again, and repeat until you only have clean seeds in the bowl. Place seeds in a glass container, in a single layer, to dry. Do not dry seeds in the oven, or direct sunlight.

I've never had a problem with my tomatoes cross pollinating. I'm glad someone asked about this.

Thanks, I was concerned about this as I like to grow several types of maters.

Good to know. I have a few different types of maters this year, and really want to save the seeds from one at least if I like the fruit-Jersey Devils.