Author Topic: A question - J.B.Pine and colanders  (Read 1747 times)


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A question - J.B.Pine and colanders
« on: March 26, 2014, 09:26 AM »
Hey Folks,

I am looking at -

Jonas Dupuich talks about the use of colanders in Japan.

Okay question - if colanders and air-pots cause the roots to continuously restart and don't have roots circling [ tests on the Tamarind show that it restarts and does not circle in an air-pot ]/
Would it make more sense to simply leave the black pines in colanders and place the colander into a bonsai pot when going for exhibition. Just dressing the surface to make it look normal for exhibition.

Should it not make repotting just a case of slicing off say 1' on all 4 sides and underneath. Like cutting cheese.

Any opinions ?
Good Day


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Re: A question - J.B.Pine and colanders
« Reply #1 on: March 26, 2014, 10:15 AM »
Arihato has developed many plants in pond baskets (similar concept to colanders) and reports that vigour and health after a decade or so in the pots starts to decline.


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Re: A question - J.B.Pine and colanders
« Reply #2 on: March 26, 2014, 10:36 AM »
Anthony if you notice in that fantastic article Jonas just posted, he says that he's not a fan of the double colander technique.  I posted a pic during repotting last month of a JBP that I tried to remove from a colander.  I slip potted this tree into the next size colander about 6 months ago.  Basically it's nearly impossible to remove the tree from the colander without cutting off nearly all the roots on the outside.  Cutting this many roots kind of defeats the purpose of using a colander inside a colander or a colander inside a pot.  I can't even imagine trying to get the tree out of the colander if I let it grow for several years.  It makes much more sense to me to just remove the tree from the colander, then slip it into the next size up. 

To answer your question a bit more, I believe after 15-40 year of growing your tree in a colander, you should take it out and work on the root ball combing the surface roots outward and gradually sloping down, while starting to flatten out the bottom of the root pad.  However, you will have a much easier time getting your tree into a Bonsai pot if it's been growing in a colander compared with growing in the ground.


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Re: A question - J.B.Pine and colanders
« Reply #3 on: March 26, 2014, 11:29 AM »
Thank you Marie and Yenling,

for the quick responses.

Marie, did Arihato, say if he took the plants out of the pondbaskets and remove any soil, either by simple slicing or pie cuts ?

Yenling, yes, plastic degrades, fortunately colanders of fine mesh stainless steel and simple bowls with holes also stainless steel are available in Trinidad and very cheap.
Additionally in the 1950's a book on growing bonsai for pleasure or sale [ was it Kittak ?] explains how to bend wire mesh into pots, stainless steel mesh is also available on the island.

What was observed in the air-pot, was a mass of roots so much so, that it looked like a single giant root.
Two points-
[1] Would one have to pie cut frequently, due to the root re-growth pattern ?
[2] Would the more efficient use of the soil, allow more above ground manipulation of branches/branchlets, or would a genetic ruling take over ?

I believe, root manipulation may be sooner than 15 to 40 years, in the tropics.
One J.B.pine is in an air-pot and the result of one year's growing will be observed by next Jan.2nd.

Thank you very much for the input.
Good Day.

This is the smallest stainless steel colander found thus far 6.5" and comes with legs. Though smaller stainless steel, drain strainers are also in use.