afforest

from WordNet (r) 3.0 (2006)

afforest
    v 1: establish a forest on previously unforested land; "afforest
         the mountains" [syn: {afforest}, {forest}]

from The Collaborative International Dictionary of English v.0.48

Afforest \Af*for"est\, v. t. [LL. afforestare; ad + forestare.
   See {Forest}.]
   To convert into a forest; as, to afforest a tract of country.
   [1913 Webster]