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TOPIC: "Tree through rock" and growing new roots

"Tree through rock" and growing new roots 1 month 2 weeks ago #53749

Years ago an acquaintance gifted with me with a strange tree he had "created".
Basically he had a nice rock with a hole going from side to side. And a young fig spontaneously growing in the garden.
He cut the fig back and put the rock on it so that the trunk went through the hole.

A couple of years later he moved it to a pot and gave it to me, as he had no idea on what to do with it.

I've been shaping it somehow for the last few years, and it is a bit of a pain (obviously) both for repotting and watering, as the rock at its base covers most of the pot, making things complicated. Still, I like it.

Now the trunk has finally grown large enough to completely fill the hole and what I'd like to do next is force it to grow new roots above the rock, where the trunk comes out of the hole, slowly moving it into something a bit easier to maintain while adding more features to its already settled character.

What's the best way to obtain that, tho?

What I'd do is -at the very beginning of the next growing season- remove some bark where I want the new roots to grow, put some rooting hormone on it and cover with some wet sphagnum; then bury the rock entirely, covering with a couple of cm of soil the treated part.

Would I be doing it right?
And would you suggest to do it with or without trimming some the existing roots (the idea being soliciting the plant to grow more roots)?
Other suggestions?

Thanks in advance.
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"Tree through rock" and growing new roots 1 month 2 weeks ago #53750

When I read your question I immediately thought "ground layering".
The point is if the "usual" ground layering system of making a thick wire girdle around the lower trunk to force the roots to grow above the wire will probably result in a weird root over rock style (if it work at all).
Perhaps the hole in the rock itself will substitute the wire's work and choke the trunk into making the new roots if you bury the whole set.
Could you please show us a picture to make it more obvious?
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"Tree through rock" and growing new roots 1 month 2 weeks ago #53753

Clicio wrote: When I read your question I immediately thought "ground layering".
The point is if the "usual" ground layering system of making a thick wire girdle around the lower trunk to force the roots to grow above the wire will probably result in a weird root over rock style (if it work at all).
Perhaps the hole in the rock itself will substitute the wire's work and choke the trunk into making the new roots if you bury the whole set.
Could you please show us a picture to make it more obvious?


That was indeed my same thought. With a caveat, tho: I'd like to "guide" the roots to go towards specific directions if possible, as the rock has other smaller holes that I'd like to use to let roots go through.
So, if there's a way, I'd like to be able to "decide" where roots would grow.

I'll send a picture as soon as I'm home, tho, to make it a bit clearer (currently sitting in an airport...)
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"Tree through rock" and growing new roots 1 month 2 weeks ago #53764

Ok, here are some pictures.

First one from the side, so you get an overall idea of the tree.


Here is a close-up of where the trunk enters the rock.


Right on the right side of the trunk is one of the "other holes" i was referring to: its exit point is that other hole farther on the right, with all that moss:



I won't add other images, but there are a couple of similar (but smaller) holes on the opposite side of the rock. I would like new roots to go through there.
The decision is then if I should just let new roots grow by simply burying the lower part of the trunk with the entire stone, as in a "natural tourniquet", to then select the ones I want to keep, or id there's a way to "guide" the tree to grow roots in the place I'd like 'em...

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