Article (magazine)  (2023)  
 
'Hansa Rugosa', Source/Accession Biltmore Estate  ...Estimated ploidy level(x) 2

Article (website)  (2007)  
 
Roses with superior resistance (less than 2% foliage infected) to black spot and cercospora leaf spot were considered no-spray roses (do not require fungicides for clean foliage).

Hansa is on the list of no-spray roses. [Note: hybrid rugosas are spray-sensitive and some will drop all their leaves if sprayed!]

Book  (Aug 2002)  Page(s) 46.  
 
Hansa
Hybrid Rugosa
Rated 8.4

Book  (2001)  Page(s) 48.  
 
Hansa Hybrid Rugosa, medium red, 1905. Rating: 8.3

Website/Catalog  (4 Jan 1999)  Page(s) 17.  Includes photo(s).

Website/Catalog  (31 Dec 1998)  Page(s) 29.  Includes photo(s).

Website/Catalog  (23 Oct 1998)  Page(s) 35.  Includes photo(s).

Website/Catalog  (1997)  Page(s) 67.  Includes photo(s).

Book  (1997)  Page(s) 230.  Includes photo(s).
 
Hip and flower

Book  (1997)  Page(s) 64.  Includes photo(s).