Healing branch

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When you cut off a branch on a tree, it exposes the wood. That wood will heal over. My question is: once that wound heals over, will it be a live vein again?
 

Wires_Guy_wires

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It can become a live vein, but it will take a long time for that to happen. 5-25 years, depending on the species.
The trunk will need to grow over the callus tissue. Callus tissue usually doesn't produce longtitudal veins.
 

Shibui

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All live bark can be a live vein. Bark that has grown over a scar is just as able to carry sap as any other live bark.
Sap normally takes the shortest route from leaf to root and there is often a strong connection between a root (or roots) and a particular branch but it is not quite as restricted as pipes like we know them. Trees have the ability to change sap path in case of damage and can create new sap flow path provided there is healthy live bark adjacent to the damaged area.
As far as I can work out this live vein on juniper idea comes from older trees where some bark has died or withered. On juniper the difference between living and dead bark is not always obvious so live sections can be cut without realizing there is no other support nearby. On most of the junipers the entire trunk is a live vein.
 
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