Your neighbours once removed to the east grow lots of Cypripediums. If you know enough German try this:
http://www.haus.de/garten/zier... The author ( Ursula Schuster) has written many articles about hardy orchids (hardy as in Germany, so certainly in Bilzen!) so check her out.
Patrick Mannens published a great article about growing Cypripediums in Belgium in NOV Orchideeen 2014!
Ruud
