|1||15C+||Indoor||Grow as a houseplant or under heated glass.|
|2||10 to 15C+||Indoor / Outdoor||Grow indoors, or outdoors in summer in a sheltered spot|
|3||5 to 10C||Tender||Grow outdoors in summer, and in a heated glasshouse in winter.|
|4||1 to 5C||Tender||Grow outdoors or under glass without risk of frost.|
|5||-5 to 1C||Half-Hardy||Hardy in coastal/mild/sheltered areas. Will not tolerate hard/sudden frost. May require winter protection in situ. such as fleece or straw mulch.|
|6||-10 to -5C||Hardy||May suffer at altitude, central/northerly locations, harsh winters, cold gardens and when grown in pots.|
|7||-15 to -10C+||Hardy||Will survive most severe winters but may be at risk in central/northerly locations and in pots. Top growth may be destroyed but will usually re-grow.|
|8||-20 to -15C||Hardy||Will survive severe winter, but may need protection when grown in pots.|
|9||-20C & Colder||Very Hardy / Hardy||in the severest European climates.|
Originating from Bhutan.
A relatively new cultivar that was propagated from a tree originally collected in Bhutan, found growing in Ness Gardens, Wirral, UK. It has shiny, deep tan coloured bark with striking white markings called lenticels. The dense crown of dark green leaves is slender when the tree is young, broadening with age to a wide crown.
Height and spread after 5 – 6 years 3m x 1.5m
Semi mature Height and spread after 12 – 15 years if not pruned 6m x 4m
Potential mature size after 20 – 25 years 12m x 8m