@milehigh_7 ,
Clyde,
I believe if you read carefully through Bonsai Today 20,
the article with the guy doing small bonsai.
He explains the use of the double and triple colanders.
The J.b.pine when encouraged to grow through one colander
into another, encourages the surface roots to go coarse.
Males them enlarge and come to the surface.
[ please note and combine this information with what I further
state below ]
Also note, what was noticed is that the seed some
J.B.pines are more extreme as softwoods go.
Some pines have a much greater genetic disposition to trunk
enlargement and surface roots.
This is not mentioned in either B.T 12 or 20.
So unless you grow a good many J.B.pine seeds, you will never
actually see this happen.
A few of our pines grow branches to 30-36 inches and gain an
inch of trunk.
Others do the above and end up with pencil trunks.
I have left images of this in the Pine forum, a while ago.
The double / triple colander effect does not work on our
local hardwood, Caribbean / Honduran pine, by the way.
Hope this explains.
Good Day
Anthony
Even today still only pencil thick.
![JBP 11.jpg JBP 11.jpg](https://www.bonsainut.com/data/attachments/191/191606-b8a72e5902081ac043d0335f24830cf5.jpg?hash=uKcuWQIIGs)