Source : Webster's Revised Unabridged Dictionary (1913)

Bourgeon \Bour"geon\, v. i. [OE. burjoun a bud, burjounen to
   bud, F. bourgeon a bud, bourgeonner to bud; cf. OHG. burjan
   to raise.]
   To sprout; to put forth buds; to shoot forth, as a branch.

         Gayly to bourgeon and broadly to grow.   --Sir W.
                                                  Scott.

Source : WordNet®

bourgeon
     v : produce buds, branches, or germinate; "the potatoes
         sprouted" [syn: {shoot}, {spud}, {germinate}, {pullulate},
          {burgeon forth}, {sprout}]