The 1760 officiating "Pastor Hartmann" made Lensahn a wedding paradise in Holstein. He also advertised for the introduction of the potato. 1769 the Grand Duke family became owners of Koselau, Sebent, Lübbersdorf, Kuhof, Kremsdorf, Bollbrügge, Sütel und Sievershagen (so-called „younger entailed estates“). In 1795 Duke Peter Frederick Louis let found activity and industry schools (handiwork lessons for young women) in Lensahn and Beschendorf. As preparation for their discharge of serfdom they were taught in practical skills like spinning, knitting, darning, sewing etc.