When the Dwarf Project was still going strong, this process of creating a stable cross sometimes took many years, sometimes less than many. Rather than begin selling or trading the several crosses in the F-1 stage the smart folks involved waited until the crosses became stable. By most definitions they had not become heirlooms but could be classified as Open Pollenated. The resulting seeds would grow true from the stable plant and fruit. I worked on several varieties that took up to F-7 to stabilize.
Not yet having grown Cherokee Carbon, I am sure I will; those two are favorites of mine separately so why not the hybrid form? Or maybe I will wait for the OP form if anyone will take the time to stabilize it.
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