I have received some info on the Chief Joseph about the understock on it from a pretty knowledgeable conifer expert. He said the understock is not an issue when it comes to raising this plant. It has to do with leaving the understock on long enough for the plant to establish itself. Anyway, I have been checking on a Chief and was wondering if anyone on here knew what type of understock Klehm's Song Sparrow uses on their plants. They don't know because they get them from somewhere else and don't know for sure.