Commercially available

• Hybrida Sieboldiana
• Hybrida Sieboldii
• Sieboldia

34 favorite votes.  
Average rating: EXCELLENT.  

Bred by B. Droog (Netherlands, 1874).
Introduced in United States by Jackson & Perkins Co. (post 1970) in 1888 as 'Ramona'.

Late Large Flowered.  

Lavender - blue.  Average diameter 7".  Large, single bloom form.  Early summer to early autumn.  

Height: up to 12' (up to 365cm).  

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