Horticulturally incorrect, I'm afraid. 'Red Piranha' is a cultivar, and in the world of cultivars, looks are king. You can get a 'Red Piranha' from a completely different set of parental plants than the originals. Same goes for all cultivars -- they are determined by looks, not exact genome.When a plant from a Red Piranha (example) has germinated, even if it looks Identical to the mother. It is NOT a Red Piranha.