When I read this many fallacies in one paragraph I tend to shy away from anything else the person has to say.
Lycopersicon lycopersicum
Almost all modern tomatoes can be safely grown without isolation and will not cross—'currant' tomatoes (such as Cherry Tomatoes), and 'potato-leafed' tomatoes (such as Brandywine) are possible exceptions and may cross other currant or potato-leaf varieties. Grow as many standard tomatoes as desired, but grow only one currant tomato or one potato-leaf tomato at a time to ensure purity (or cage them, or separate varieties by 500 feet). Currant and potato-leaf tomatoes will not usually cross with common tomato varieties.
It's best to not plant all a valuable variety's seeds in one season until you are sure it doesn't cross with any other varieties you grow.
http://www.howtosaveseeds.com/seedsa...s.php#tomatoes
Sorry but this just isn't so.
Worth