Saving your own tomato seeds from homegrown heirloom tomatoes will give a better tasting and producing tomato as it adapts to your location in just a couple of years. You only need a few fruits and some simple tools to get started.
A few considerations on saving your own tomato seeds: select fruit that are fully ripe or even just slightly overripe to get mature seeds; choose fruit with the characteristics that you are looking for — best-looking, best-tasting, earliest, latest or perhaps, largest. This will help you achieve more of the same qualities next year.
Finally, make sure that you are choosing open-pollinated or heirloom tomatoes, as hybrids from the store won’t grow true to what you started with. Saving some of your own seeds helps carry on an ancient gardening tradition many generations old.
The fermentation method duplicates what happens naturally when a tomato falls off the vine, ferments and then rots, leaving the seeds ready to germinate next spring.