WHEN TO PRUNE OAKLEAF HYDRANGEA...
Oakleaf hydrangea (Hydrangea quercifolia) — This outstanding native native grows 6 to 8 feet tall and wide and develops striking burgundy-red fall foliage. Among the Grump’s favorite selections are ‘Snowflake’ (inner florets stay white, outer florets turn rose in summer), ‘Harmony’ (huge clusters of double white flowers), and ‘Pee Wee’ (dwarf plant to 3 feet tall, blooms at a young age). Oakleaf hydrangea blooms on the previous year’s growth, so cut it back (although it rarely needs it) in early summer.