The Collaborative International Dictionary of English v.0.48:

Shrubbery \Shrub"ber*y\, n.; pl. Shrubberies.
   1. A collection of shrubs.
      [1913 Webster]

   2. A place where shrubs are planted. --Macaulay.
      [1913 Webster]

WordNet (r) 3.0 (2006):

shrubbery
    n 1: an area where a number of shrubs are planted
    2: a collection of shrubs growing together

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "shrubbery":
   Japanese garden, alpine garden, arboretum, bed, bog garden, border,
   botanical garden, bracken, brake, bramble, brier, brier bush, bush,
   coppice, copse, dry garden, flower bed, flower garden, garden,
   garden spot, grape ranch, grapery, hedgerow, hedging, herbarium,
   hortus siccus, jardin, kitchen garden, market garden,
   ornamental garden, paradise, pinetum, rock garden, roof garden,
   scrub, shrub, sunken garden, tea garden, thicket, truck garden,
   underbrush, undergrowth, vegetable garden, victory garden, vinery,
   vineyard