planting of trees and plants / trees or plants that have been planted

raise, grow trees and plants

improvement, an action taken to improve / improvement, a spontaneous change for the better

(transitive) to improve, to make better / (intransitive) for something to improve on its own

betterment, improvement, amelioration

new, novel / latest, recent / modern / fresh

farm / cultivation / plantation

a surname

(archaic) new, novel / (archaic) latest, recent / (archaic) modern / (archaic) fresh

(obsolete) Alternative spelling of 新たし (aratashi): new, novel