I bought an Oroblanco (Sweetie) fruit from store (origin Israel) and to my surprise I found a seed. Now it's supposed to be seedless, maybe some bee pollinated with another citrus.
Anyway I planted in the incubator and after a week a seedling came out.
I know grapefruit and pomelo, the parents, take 8-15 years, or never if the seed was sterile.
Did anyone try it before?