Just returned from a Black Forest Switzerland working tour. The last stop was the last 2 days with Jürg Stäheli who certainly owns one of the best fully self-grown native deciduous tree collechtion that I know. Jürg has been working on some of the trees for more than 30 years. It was a great honor with him at one of his best and the best Carpinus betulus I have ever seen to work and improve.