Japanese white pine "glauca" meaning?

[Azz]

I just got my first JWP today as I just came across it on its lonesome at the local garden centre. I am struggling to find out more about the cultivar "glauca". Does anyone have anymore information on it? What exactly is different about it? I have also come across a comment that it is on black pine roots, is this true? if so could this be bad for me with my climate, as I know black pine aren't as tolerant to the cold. (Scandinavia 5b). Is it possible it could be on the roots of something more cold hardy since it was sold here?

 

[Deep Sea Diver]

Greetings!

Japanese White Pine glauca normally has bluish needles, five to a facsicle, fairly slow growing and will assume an open rangy look if not pruned to backbud as we do in bonsai. Glauca is the main type of JWP used for bonsai, yet there are many other cultivars on the market with tighter foliage… one of the smaller is Zuishio.

USDA zone is reported as 5-8ish. Practically this means your tree in zone 5 will need protection during the winter. This is because trees in pots lose at least a zone on cold hardiness. If recently worked prior to winter, 40 days, definitely need extra protection.

Grafted stock. JWP is often grafted on JBP to grow faster. This will not give better cold hardiness as it has about the same cold hardiness as JWP.

One of the first things we ask when starting a thread about a tree is for folks to post a couple decent images with detail…. Top foliage and trunk. A couple good images of the trunk will help use determine this.

Cheers
DSD sends

 

[Brian Van Fleet]

Glauca is Latin for gray, but is most often associated in horticulture with blue or blue-gray.