I've got an issue I need help/input on please. Started repotting my nice collected amer. hornbeam and made the move to cut off this lower tier of roots/bottom of the tap. to my dismay I found some rot in the center. it turns out there's some kind of old opening/wound on the side under one of the main roots that I never saw. so that's the opening/access but then there's a vertical hollow then runs UP like a good 6 inches. I rinsed the hollow out with hydrogen peroxide a couple of times to start disinfecting it.
![1680839849264.png 1680839849264.png](https://www.bonsainut.com/data/attachments/470/470037-29e5d751fa4167724288c62256f211b4.jpg?hash=KeXXUfpBZ3)
I rinsed the hollow out with hydrogen peroxide a couple of times to start disinfecting it.
![1680839920452.png 1680839920452.png](https://www.bonsainut.com/data/attachments/470/470038-206dcbd96ccddcc0484569eeb157bc69.jpg?hash=IG3L2WzN3M)
Unfortunately this is also time sensitive. The tree is currently sitting in water pending repair but needs to be repotted asap. I've seen demos on here where people have used cement to fill in wounds on the trunk from a branch cut, but I don't think that's the answer in my case, I'd end up with a big air pocket probably.
One thought I had was to possibly try using spray foam insulation because I can get way in there and it expands. But I don't know how water proof that is and would likely still need a better seal on the two openings.
![1680839849264.png 1680839849264.png](https://www.bonsainut.com/data/attachments/470/470037-29e5d751fa4167724288c62256f211b4.jpg?hash=KeXXUfpBZ3)
I rinsed the hollow out with hydrogen peroxide a couple of times to start disinfecting it.
![1680839920452.png 1680839920452.png](https://www.bonsainut.com/data/attachments/470/470038-206dcbd96ccddcc0484569eeb157bc69.jpg?hash=IG3L2WzN3M)
Unfortunately this is also time sensitive. The tree is currently sitting in water pending repair but needs to be repotted asap. I've seen demos on here where people have used cement to fill in wounds on the trunk from a branch cut, but I don't think that's the answer in my case, I'd end up with a big air pocket probably.
One thought I had was to possibly try using spray foam insulation because I can get way in there and it expands. But I don't know how water proof that is and would likely still need a better seal on the two openings.