- Dominant species in the Smokies include the smooth hydrangea ( " Hydrangea arborescens " ).
- Four handsome hydrangea species do bloom reliably through most of New England : the huge flowered Annabelle and other Hydrangea arborescens, the tree-like PeeGee hydrangea ( H . paniculata ), the very shade-tolerant native oakleaf hydrangea ( H . quercifolia ), and the climbing hydrangea ( H . anomala ), the best blooming vine for shade.
- The Pennsylvania gold medal winners for 2001 are a large evergreen tree, Ilex opaca, American holly, with bright red berries ( if there is a male nearby ); Hydrangea arborescens Annabelle, smooth hydrangea, a shrub three to five feet tall with foot-wide clusters of white flowers; and Cornus mas Golden Glory, the Cornelian cherry dogwood, which can grow as a large shrub or a small tree.