A new cultivar of Hydrangea macrophylla plant named ‘Mysterious’ that is characterized by its inflorescences that are flattened globular in shape with conspicuous sterile flowers, its strong branches, its sterile flower with sepal colors that range in different conditions from red-purple (non-bluing conditions) and violet-blue (bluing conditions), and its sterile flowers with sepals that have light to medium green blotches that vary in size and frequency (from no blotches to almost completely covered).
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