Book  (1999)  Page(s) 200.  
 
Dirigent, This shrub has blood red semi-double blooms, that have a slight fragrance. They appear in clusters made up of as many as 28 blooms, 'Dirigent' is a vigorous plant with very healthy, leathery foliage that is good for borders or as a specimen shrub. [Fanel x Karl Wienhausen], Tantau, Germany, 1958

Website/Catalog  (31 Dec 1998)  Page(s) 17.  Includes photo(s).

Book  (Apr 1993)  Page(s) 133.  
 
Dirigent® Shrub, blood-red, 1956, ('The Conductor'); 'Fanal' x 'Karl Weinhausen'; Tantau, Math. Description.

Website/Catalog  (1970)  Page(s) 13.  
 
GRIMPANT DIRIGENT. — Rouge écarlate velouté. Floraison continuelle.