Website/Catalog  (1931)  Page(s) 31.  
 
Clematis ... Large blooms, less vigorous climbers, approx. 8 to 15 cm bloom diameter.....Clematis Polarlicht, pure light blue, May/June, 60/80 cm ...2,50 Marks [10] 22,50 [100] 200,--

Website/Catalog  (1920)  Page(s) 4.  
 
New and rare plants. Clematis novelties of own breeding.
'Polarlicht' (G & K). Soft lavender-blue blooms and very large blooms are the valuable characteristics of this novelty...1 piece M 10.-