The Collaborative International Dictionary of English v.0.48:

daisybush \daisybush\, daisy bush \daisy bush\n.
   any of various mostly Australian attractively shaped shrubs
   of the genus Olearia grown for their handsome and sometimes
   fragrant evergreen foliage and profusion of daisy flowers
   with white or purple or blue rays.

   Syn: .
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

daisy bush
    n 1: any of various mostly Australian attractively shaped shrubs
         of the genus Olearia grown for their handsome and sometimes
         fragrant evergreen foliage and profusion of daisy flowers
         with white or purple or blue rays [syn: daisybush,
         daisy-bush, daisy bush]