I believe that the genes of red tomatoes are also invasive. I believe that people just don't notice because it's harder to tell the difference between a red tomato and a red tomato than it is between a red and a blue.
I am thrilled whenever someone sends me seeds that are "not true to type", or that have been "polluted". In my garden that is the most welcome kind of tomato seed.
If someone values purity, then the invasiveness of the blue gene might be welcomed, because it would make it easier to identify impure varieties.
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