Most full service nurseries near me (Cincinnati) carry the oak leaf
hydrangea. It is a little slow growing so you may not want to plant a tiny
pant and wait forever for it to grow. Surely there are some big nurseries
in the Pittsburgh area that carry this plant. There are lots of large
commercial producers in NE Ohio. They must distribute to your area. You
probably won't find it at Wal-Mart or places like that. I know that the
nursery that I buy from will order things for you if you give them some
notice. You might call someplace like Phipps Conservatory or an arboretum in
your area and ask if they know where this plant can be purchased locally or
give you the name of several full service nurseries or landscape supply
firms.
Here is a like to a google search with some information. It sounds like
your friend has Hydrangea Paniculata 'Unique'
http://www.google.com/search?hl=en&safe=off&q=hydrangea+unique&spell=1
Rhoda Dend wrote:
'Unique' is a specific cultivar of Hydrangea paniculata noted for its large
flowerheads comprised mainly of sterile florets. Paniculatas - the PeeGee hydrangea
is probably the most common cultivar - are robust shrubs that are very hardy and
tolerate more sun and less water than other forms of hydrangeas.
As to buying a unnamed form of oakleaf hydrangea, you are hardly letting yourself
open to serious disappointment. The straight species (Hydrangea quercifolia) is a
wonderful shrub with no drawbacks - same exfoliating, cinnamon colored bark, same
large white flower panicles, same big, bold foliage with great fall color. 'Alice'
is remarkable for intense fall color and 'Snow Queen' produces exceptionally large,
sterile flowerheads, but that does not detract from the value of the species.
Pam - gardengal