The PeeGee hydrangea can be pruned into tree form.
Its species name, Hydrangea paniculata, refers to the pointed flower clusters, or panicles.
Unlike Hydrangea macrophylla, the PeeGee flower color does not vary with soil pH.
PeeGees bloom in mid-summer. The flowers start out white, and as they age, turn pink and then rusty brown.
A friend of mine says of the PeeGee: "These old fashioned hydrangea remind me of over-powdered old ladies of the south."