Source : Webster's Revised Unabridged Dictionary (1913)

Green \Green\, v. t. [imp. & p. p. {Greened} (great): p. pr. &
   vb. n. {Greening}.]
   To make green.

         Great spring before Greened all the year. --Thomson.

Greening \Green"ing\, n.
   A greenish apple, of several varieties, among which the Rhode
   Island greening is the best known for its fine-grained acid
   flesh and its excellent keeping quality.

Source : WordNet®

greening
     adj : turning green; leafing out; "overgrown with greening trees
           and underbrush"
     n : the phenomenon of vitality and freshness being restored;
         "the annual rejuvenation of the landscape" [syn: {rejuvenation}]