i have heard that if your mints are planted close to one another that they will all cross-pollinate and you will end up with mints that are not what you started with (aka chocolate mint will be another scent and so on)
therefore I would think that most all mint varieties can cross pollinate.
-renee

I'm sure that they can cross-pollinate, but how do I do it? Mint flowers are very small.
Thanks,
Josh