In the steamy greenness of the midsummer landscape, white flowers can add a cooling touch, sort of a visual equivalent to a scoop of vanilla ice cream. Several hydrangeas have just such a refreshing floral display, including oakleaf hydrangea [Hydrangea quercifolia) and its cultivars. This species is native to the southeastern United States, growing from North Carolina to northern Florida and west to Termessee and Louisiana, but it also grows well in other regions. It is recommended for USDA Hardiness Zones 6 to 9 (average annual minimum temperature -10 to 0°F [23.3 to 17.8°C]) and may also survive in Zone 5 (average annual minimum temperature -20 to -10°F [28.9 to 23.3°C]).
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