Because smooth and panicle hydrangeas develop flower buds and bloom all in the same growing season ... bigleaf hydrangea (Hydrangea macrophylla) or oakleaf hydrangeas (Hydrangea quercifolia).
These are bigleaf (Hydrangea macrophylla), panicle (Hydrangea paniculata), oakleaf (Hydrangea quercifolia), and ... form again until after the next flowering season. Sometimes there is confusion ...
resulting in "no flowers at all". Ben highlighted that hydrangea macrophylla and quercifolia flower on old wood, so they "need pruning directly after flowering" in autumn. On the other hand ...
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