The Collaborative International Dictionary of English v.0.48:

Boll \Boll\, v. i. [imp. & p. p. Bolled.]
   To form a boll or seed vessel; to go to seed.
   [1913 Webster]

         The barley was in the ear, and the flax was bolled.
                                                  --Ex. ix. 31.
   [1913 Webster]