Hello, the breeding year for 'Glarona' can be put more precisely. 'Glarona', named already, was exhibited by Dr. Krüger (Freiburg) at the Horticultural Show at Breslau in 1913. From a report of "Die Gartenwelt" about this exhibition: "Dr. Krüger showed [...] Glarona, pink, globular when young, promising." [Die Gartenwelt; 17.edition, 1913, page 415]