Hopefully the following will help. I visited today with a well known propagator at a well known, reliable mail order nursery located in my city. He, by the way, visits your botanical garden on his trips north but has never introduced himself to you. He was surprised that you were having problems rooting Edgeworthia. His methods....(1) semi-hardwoods, use Dip & Grow at a 10-1 strength, root under mist...and...(2) Hardwoods set to root in winter, use Dip & Grow at a 5-1 strength plus bottom heat.