from The Century Dictionary.
- To remove, as that which is planted; uproot; deprive of plants; hence, to depopulate.
Sorry, no etymologies found.
'Twas he did plant me in the miry pool and say I did dance well but somewhat slowly when I did try to unplant myself, and for every foot I took up sunk the other deeper in the mire.
A planter is a tree that has 'replanted' itself into the river bottom, under water temporary; will unplant itself at any given moment.