The Collaborative International Dictionary of English v.0.48:

Shrubby \Shrub"by\, a. [Compar. Shrubbier; superl.
   Shrubbiest.]
   1. Full of shrubs.
      [1913 Webster]

   2. Of the nature of a shrub; resembling a shrub. "Shrubby
      browse." --J. Philips.
      [1913 Webster]