Commercially available

• C. coerulea Lindl.
• C. viticella 'Coerulea Grandiflora'
• C. patens C. Morren. & Decne.
• Caerulea
• Caerulea Grandiflora
• Clematis azurea
• Clematis azurea grandiflora
• Clematis florida azurea
• Kazaguruma
• Patens
• Patens Blue

22 favorite votes.  

Bred by Unknown(Japan) (Japan, before 1836).
Introduced in Netherlands by Philipp von Siebold in 1836 as 'Patens'.

Group 3, Species.  

Deep blue, purple stamens, ages to pink .  6 to 8 petals.  Average diameter 5".  Large, single bloom form.  Mid-to-late summer.  

Height: 6' to 8' (185 to 245cm).  

USDA zone 4b through 9b.  Plant in sun or partial shade.  Suitable for growing in a container.  It blooms on the previous year's growth, so resist the urge to prune it in early spring.  In early spring, cut back to just above the lowest set of healthy buds.  

Diploid

If you know the parentage of this clematis, or other details, please contact us.

Native in China and Japan.
Bull. Acad. Roy. Sci. Bruxelles 3: 173 1836.