The Collaborative International Dictionary of English v.0.48:

Verbenate \Ver"be*nate\, v. t. [imp. & p. p. Verbenated; p.
   pr. & vb. n. Verbenating.] [L. verbenatus crowned with a
   wreath of sacred boughs. See Verbena.]
   To strew with verbena, or vervain, as in ancient sacrifices
   and rites.
   [1913 Webster]