So I just found out that peppermint (mentha piperita) is a sterile hybrid between spearmint (mentha spicata) and watermint (mentha aquatica) and so growing peppermint seeds will result in a poor quality mint variety but not true peppermint. As a result, everyone suggests obtaining peppermint through a cutting.
What I don't understand is why can't the seeds of the cross pollinated plants (spearmint and watermint) be sold? Wouldn't they all be true peppermint? Many seed companies sell their own F1 hybrid seeds. Wouldn't the seeds of a spearmint x watermint be the F1 peppermint hybrid?