Hydrangea macrophylla 'Mystical Opal' lives up to its name with flowers that display an opalescent, iridescent quality—shifting between pink, blue, lavender, and green depending on light, age, and soil chemistry. This cultivar captures the mercurial beauty of its namesake gemstone.
The mophead inflorescences are medium-large, 6–8 inches across. The sterile florets have a unique, multi-tonal appearance: each floret can show pink edges, blue centers, and green undertones simultaneously. As the flowers mature, they transition through a spectrum—pale pink to lavender to blue to greenish-antique—often displaying multiple colors on a single head. The effect is mesmerizing and truly opal-like.
The shrub is compact, 3–4 feet tall and wide, with healthy green foliage.
'Mystical Opal' is exceptionally responsive to soil pH, but its iridescent quality transcends simple blue/pink dichotomy. In slightly acidic soil (pH 5.5–6.0), the full opalescent range expresses best. Standard culture: morning shade, moist rich soil, USDA zones 6–9. Blooms on old wood.
'Mystical Opal' is a plant to watch daily—the flowers change before your eyes. Site it where the color shifts can be appreciated: near a patio, along a frequented path, or in a container. The opalescent blooms are extraordinary in arrangements, where individual florets can be separated to show their multi-tonal nature. A cultivar that turns hydrangea color magic into high art.
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