Knock Out or Double Knock Out?

The ones I,m referring to are considered to be a climber.

I would have said Knockout too, but if it's a climber, maybe Dr. Huey? Not that it's a climber, either, but it's very cane-y.

I was thinking along those lines too :) Dr. Huey is a common rootstock and if the grafted climbers died, the rootstock remains and flourishes. I've got a couple of those in my yard and see them around the neighborhood too. One of my neighbors is amazed by her yellow climber that 'turned red'. Uh :)