Book  (Aug 2002)  Page(s) 52.  
 
Karl Herbst
Rated 6.4

Website/Catalog  (2000)  Page(s) 112.  
 
H.T., Karl Herbst, Kordes W., 1950

Book  (Dec 1998)  Page(s) 335.  Includes photo(s).
 
Karl Herbst Hybrid Tea. Kordes (Germany) 1950. Description... deep red color, darker on the inside of the petal... Karl Herbst was a lifelong friend of Wilhelm Kordes, both of them having been interned as enemy aliens by the British in World War I...

Book  (Sep 1993)  Page(s) 236.  Includes photo(s).
 
Karl Herbst ('Red Peace', 'The Old Bull') Large-flowered... Herr Herbst was Wilhelm Kordes's right-hand man for many years... huge, fire-red flowers. Even more apprropriate is the nickname given by the hybridists, 'The Old Bull'. The pollen of Karl Herbst is potent indeed, and its descendants are legion...

Book  (Apr 1993)  Page(s) 284.  
 
'Karl Herbst'. Hybrid Tea, medium red, 1950, ('Red Peace'); 'Independence' x 'Peace'; Kordes. Description.

Website/Catalog  (1982)  Page(s) 3.  
 
Karl Herbst rouge écarlate.
[no longer listed in 1987]

Article (misc)  (1980)  Page(s) 22.  
 
Karl Herbst known as the Old Bull because it was used so frequently [in hybridizing]

Book  (1978)  Page(s) 99.  
 
'Karl Herbst'   Medium    Red  Remontant    P1  H1 
A vigorous red rose, bred from 'Independence' x 'Peace' by Wilhelm Kordes, and introduced in 1950. I remember my reply on being asked whether we should grow it, that a dull red rose with no scent was not likely to be sold. And it certainly proved difficult. It was somewhat ugly except when its flush coincided with hot weather, in  which case the blooms were one and all large and shapely. But it never was the rose the ordinary gardener wanted. 
For breeders, it was an important variety, for it proved an effective pollen parent.  It was said that one could not go wrong by putting its pollen on a yellow variety. All I can say is it never worked for me, but I admit I was late in the field. 'Karl Herbst' was vigorous and healthy, and future rosarians may perhaps point to him as a significant breeding rose. 

Website/Catalog  (1975)  Page(s) 7, 15(photo).  Includes photo(s).
 
KARL HERBST  Rouge carminé écarlate. 65/75 -  recommandée pour fleurs coupées  - Fleur très double, de forme enroulée. De longue durée. Feuillage brillant.

Book  (1971)  Page(s) 32.  
 
Karl Herbst [McGredy is talking about using this rose in hybridizing] will often give roses with black marks on the outer petals, will nearly always give a full flower, and will give a plant of awkward habit...