Oakleaf Hydrangea (Hydrangea quercifolia), is of the best picks for deep shade, this southeastern native features cone-shaped blooms from mid- to late summer and hefty leaves that turn purple-red in autumn. &#x27;Snow Queen&#x27; (shown) is especially bright in fall. Size: 4 to 10 feet tall and up to 8 feet wide Zones: 5 to 9