Answer: It could be: Peegee hydrangea (Hydrangea paniculata) The common name "peegee" comes from the "p" for paniculata and "g" from 'Grandiflora', an old cultivar introduced in the 1860s. Has large white flowers that grow 8 to 10 inches long and about 5 inches wide.
Or Hydrangea quercifolia 'Snow Queen' which has large, upright-growing sterile flowers 6 to 8 inches long and 5 inches wide. Sometimes called Oakleaf Hydrangea because of the leaf shape.
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