They're all coming from J Frank Schmidt in the Willamette Valley of western Oregon.

https://jfschmidt.com/introductions/index.html

The Willamette Valley is not generally an alkaline soil area. I have read elsewhere on Garden Web in the past about poor autumn coloring under eastern conditions of the particular introductions from the series being discussed at that point in time. If a bunch of relevant personal recollections don't now appear on this thread try reading the patent descriptions of the three that have been patented, because those will have a lot of detail that may even include mention of performance on alkaline or diverse soils in one or two instances.