Regrowth from the roots

One thing I’ll do is this fall I will cut some root chunks and try to grow them indoors to see what happens. Definitely is a difference on thickness of roots being viable. What red sun is showing are mostly feeder roots which definitely won’t sucker. I think the thickness roots say sharpie size or bigger are needed to store enough energy to grow a new vegetative node. I personally have seen stem above ground push growth from non node points when I first started. The cutting was one inch diameter and rooted heavily into a one gallon pot grew nicely but something broke off the only green growth, a week later little green bumps formed on the cutting in random spots and produced new nodes/shoots. If there is energy available I’m sure anything is possible but maybe not the standard.
Underground, you do not need nodes at the main trunk. When there is no viable node(s) at above ground, the plant will push new shoots from underground. This is what we see all the time.

With your kind of experiment, I've buried large chunk of thick roots, some even with some old crown, in 5G or 7G large pots. They all failed to grow any new shoots. The problem is the old crown or any old stem. They are not viable any longer. The large roots won't help since those old roots won't produce shoots. I've done this experiments many years since I always wanted to give those large roots any chance to grow. But they just have not produced any.
 
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Underground, you do not need nodes at the main trunk. When there is no viable node(s) at above ground, the plant will push new shoots from underground. This is what we see all the time.

With your kind of experiment, I've buried large chunk of thick roots, some even with some old crown, in 5G or 7G large pots. They all failed to grow any new shoots. The problem is the old crown or any old stem. They are not viable any longer. The large roots won't help since those old roots won't produce shoots. I've done this experiments many years since I always wanted to give those large roots any chance to grow. But they just have not produced any.
No loss in trying, the parts I’ll test will be thrown out anyway. It seems absurd the plant just dies without a node to grow from after surviving all winter. Maybe the established root mass being undisturbed in ground allows it to grow new buds where there is no nodes. I took some long internode cuttings and rooted as single node trees, those for sure would just die if that one above ground node was removed for any reason and does not make sense the plant just gives up and withers away. I’m thinking the time frame is definitely extended but with enough mass and healthy root ball they will push something even if it’s towards the end of summer rather than spring time.
 
Here’s a tree that was cut down to soil line, transplanted into a new pot and the stump was maybe about half an inch above soil line if that. Noticed some growth today and it shot from under soil, about 6-8 inches away from where the stump is. So pretty certain it shot some growth from roots :)
 

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So now we have roots, shoots and suckers. :)
This cutting grew them all from under the main trunk.
I may need to keep this one around for being and over achiever. :)
 
the growth does look like it has nodes as a buried stem would and roots would not. It's a buried branch from another branch that has formed roots.
Yes. This is my point. This is exactly how those suckers are formed. In botanic term, this is similar to the rhizome. Some plants, like bamboo and jujube, can travel feet or longer. But fig "rhizome" only travel some inches.
 
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