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Hydrangea Collection
The hydrangea collection (Hydrangea sp.) contains 3 species, 7 cultivars and a total of 25 specimens.  Hydrangeas are known for their coarse foliage and giant flower heads.  Though mostly white, there are now at least a couple of blue and pink flowering hybrids that are hardy.  To maintain a blue color, acid fertilizer and aluminum sulphate must be added regularly to the soil mix.

Arboretum Gardens and
Collections

Display and Specialty Gardens
  Annual Garden
  Dahlia Trial Garden
  Daylily and Chrysanthemum Walk
  Dwarf Conifer Collection and
    Waterfall Garden
  Entrance Garden
  Fern Walk
  Hedge Collection
  Home Demonstration Gardens
  Hosta Glade
  Iris Garden
  Japanese Garden
  Lilac Collection and
    Blackman Garden
  Lily and Dahlia Collection
  Maze Garden
  Ornamental Grass Collection
  Peony Walk
  Perennial Garden
  Rain Gardens
  Rose Gardens
  Sensory Garden
  Shade Tree Exhibit
  Terrace Garden
  Woodland-Azalea Garden
  Visitor Center
  Dahlberg Welcoming Terrace
  Keating Terrace
  Newton Dining Terrace
  Sweatt Entry Terrace
  Wall Teaching Garden
  Wright Terrace Gardens
  Wildflower Garden
  Garden for Wildlife

Native Areas
  The Prairie
  Spring Peeper Meadow
  The Bog Area

Shrubs
  Azalea Collection
  Bailey Shrub Walk
  Hydrangea Collection
  Lilac Collection
  Miscellaneous Shrub Collection
  Pea Shrub Collection
  Potentilla Collection
  Rhododendron Garden
  Spirea Collection
  Viburnum Collection
  Weigela Collection

Trees
  Arborvitae Collection
  Ash Collection
  Birch Collection
  Buckeye Collection
  Corktree Collection
  Crabapple Collection
  Elm Collection
  Hawthorn Collection
  Larch Collection
  Linden Collection
  Locust Collection
  Maackia
  Magnolia Collection
  Maple Collection
  Nut Collection
  Oak Collection
  Pine Collection
  Poplar Collection
  Prunus Collection
  Small Tree Collection
  Serviceberry Collection
  Spruce Collection
  Weeping Tree Collection
  Willow Collection