the wood takes 2 3 years to root .......the point is to have a way to move the whole thing at the same time .......other wise u have to use wire and have that in the soil so the planter is the center point to move the whole thing
and if worried about that just spray on some rubber ( u know flex seal) sealing the wood from the planter moisture ...or shalac the wood or paint it or coat it in mylar for reflective reasons