Answer: One thing to remember about shade is that there are different types of shade, such as that provided by buildings vs. that provided by an overhanging tree. Partial shade may also mean sun for half a day, but if that sun is in the afternoon and includes the hour of noon, then it counts as a full sun location rather than a partly shady one -- because afternoon sun is so intense and hot. Climbing hydrangea, Hydrangea anomala subsp. petiolaris seems to do well in shade, part shade, or sun. The Bigleaf Hydrangeas (H. macrophylla) types including lacecaps will certainly grow in partial shade (or sun). It may be more important than light to site them in a protected location so they do not winterkill excessively.
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