Yes, definitely was hybrid scion on top of hybrid root stock, something like a Rebelski on a Maxifort for instance.
If you visit Johnny's Seeds you can find hybrids grafted, they have Big Dena, Geronimo, Rebelski and a couple of others all available as grafted plants. I know most of the HUGE growers use grafted plants, but these growers are growing out plants for 11 months or so, I can understand the benefit of increased vigor for that length of a growing season, just not sure it benefits a smaller greenhouse grower who has a season more like 6 or 7 months in total.
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