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Vance, what are we going back n forth on?No; I am not telling you that, but they do grow differently and the difference can be favorable. The trunks will continue to thicken, some say they wont and they are wrong, and the bark they produce is far more attractive than bark produce on trees in the ground for the same number of years in comparison.
However; here is a point. If you have ever seen a Ponderosa Pine in Yosemite Valley, the bark on one of those giants is beautiful and distinctive, almost like a checker board. I have never seen a collected or pot grown Pondy with this kind of bark. Conclusion: In order for a Pondy to acquire this kind of bark the tree has to be mature and free growing.
If you grow a tree in the ground the trunk will thicken but the bark will remain featureless compared to the same species of tree grown in a Bonsai Training Planter, colander, or pond basket. The bark in these trees tend to adhere and stack up instead of flacking off in much the same way a pine sheds older needles. Anyone who has payed attention to the developing bark on younger Pines will notice how easily it is damaged and flakes off.
@Anthony posted his thread regarding the use of double colanders...
To me sure if you want to use both of them cool. The whole point of the use of a colander is to allow more oxygen and root prune. Using the two allows for more oxygen but doesn't root prune. So, one could argue putting a tree just in a normal bonsai pot is pretty much going to do the sane thing. They could put it on top of another pot, the ground, in the soil as I have suggested, and allow for drastic growth and roots to run free... Seeing this is the whole point of why one would to then put one on top of another. I do the very same thing with my shohin and mame ' s, especially the one's that have very active growth... I sit them on top of larger pot with soil, so they can still remain active in the growing season, and I don't have to keep cutting roots coming out the bottom of the pot... especially in my location... Seeing that most of our trees down here don't air prune... they will grow out the bottoms of the pot, across the benches and down to the ground if I let them.
All I have said is that it is counterproductive to try and grow a tree out ( trying to obtain massive growth) in one of these. That it would be better if one is trying to do this, not to use it.
No where in any of this was a discussion regarding bark? Sure, I can see how growing a tree very slowly with lots of oxygen to the roots, is going to help establish perhaps better looking bark. I can also understand @Adair's point as well of establishing perhaps a better radiating nebari... I get all of this and I am not saying otherwise.
Growing a tree in such conditions is going to drastically effect everything and make it smaller, whether it is bark, roots, branches, nodes spacing, foliage, etc...
But, this is just the opposite of growing a tree out, isn't it? Which is all I have said...
I have put trees in colanders to see the effects for myself first hand... I do not longer use them... I haven't seen the advantage in my location, that I can't get through using a normal bonsai pot. I have actually found that anything I put in one didn't do as well... mostly due to my amount of sun and growing season. They didn't stay moist long enough and I wasn't going to water them 10 times a day. Not only would my wife kill me seeing our water bill would be enormous, but I would quite literally spend every moment of the day doing so.
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