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'Vanso' clematis Description
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'Vanso' clematis photo
Photo courtesy of jedmar
Availability:
Commercially available
Synonyms:
HMF Ratings:
23 favorite votes.  
Average rating: EXCELLENT.  
Origin:
Discovered by Hans Van Haasterd (Netherlands, before 1998).
Class:
Early Large Flowered, Group 2.  
Bloom:
Violet.  Average diameter 5".  Medium to large, double bloom form.  Late spring to early summer, early autumn to midautumn.  
Habit:

Height: 6'7" to 9'10" (200 to 300cm).  
Growing:
USDA zone 5a and warmer.  Suitable for growing in a container.  It blooms on the previous year's growth, so resist the urge to prune it in early spring.  
Patents:
United States - Patent No: PP 15,953  on  13 Sep 2005   VIEW USPTO PATENT
Application No: 10/029,663  on  18 Dec 2001
Inventors: van Haastest; Frans C. M. (Holland, NL)
Assignee: Pride of Place Plants (Sidney, CA
`Vanso` was discovered as a natural branch mutation of the variety `Mrs. Chalmondeley`, not known to be patented.
Ploidy:
Diploid
Notes: