He maintained good contacts with Luxembourg nurseries (Soupert & Notting, Gemen-Bourg, and Ketten Frères), who distributed his varieties.
Likewise aristocratic and military worthies, though the sabre rattles more loudly than usual: the rose 'Herero-Trotha' celebrates von Trotha's genocidal efforts in German Southwest Africa.
Other names show Lambert's interest in poets ('Hoffmann von Fallersleben'), wine-growing areas and chess players.
"Lambert's garden in the walls of the old Benedictine abbey in Trier and his collection of roses … were all destroyed during World War II.
Lambert and his firm survived World War I but Not surprisingly his production of new varieties declined in the 1930s, his own seventies.