If your potato leaf selection has now become regular leaf it was crossed.
There is no other way. Potato leaf, once expressesd in the phenotype is fixed and stable. From F2 in the case of all of mine.
The discussion on the other group is backward. In a cross between a regular leaf and a potato leaf you will continue to see potato leaf plants in larger growouts from seeds of unstable regular leaf plants for numerous generations. But if the seeds are from even an unstable potato leaf selection, ALL progeny ftom that fruit will be potato leaf unless there has been a cross.
KarenO
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