Tieball
Masterpiece
My trees in development are all in grow boxes. I don’t have any scientific explanation of why I do what I do. I bury the roots to keep them growing well. I also have a mesh screen I put on top the the substrate level. I consistently get strong fine root development....and also get a lot of roots closer to the surface that develop quickly. I really started to use the mesh to keep myself from walking substrate away from the roots I intentionally buried. The mesh also keeps the birds and chipmunks away and keeps the substrate shaded. The use of the mesh and the buried roots just works for me. I attached a photo of the mesh covered over an American Elm in development.