Onyx™ Flamingo is a striking bigleaf hydrangea variety that pairs bold foliage and stem color with vibrant blooms. Its most distinctive feature is its jet-black stems, which provide dramatic contrast to the large mophead flowers. The blossoms emerge a soft flamingo pink in neutral to alkaline soils and can shift to lavender-pink or even purplish tones in more acidic conditions.
Blooming from early to mid-summer and sometimes reblooming later in the season, Onyx™ Flamingo grows 3 to 4 feet tall and wide, making it ideal for borders, containers, and foundation plantings. Its dark green foliage further enhances the contrast against its colorful blooms and black stems, giving the plant a modern, architectural appeal.
This hydrangea thrives in part shade to full sun (with some afternoon protection in hotter climates) and prefers moist, well-drained soil. Prune lightly after flowering, as it blooms on old wood.
Key Features:
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Large flamingo-pink to lavender mophead blooms
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Dramatic black stems for bold contrast
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Blooms on old wood in early to mid-summer, with potential for rebloom
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Grows 3–4 ft. tall and wide
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Thrives in part shade to full sun with well-drained soil
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Ideal for borders, containers, and modern landscapes
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Hardy in USDA Zones 5–9
Hydrangea Onyx™ Flamingo is a stylish, eye-catching choice for gardeners who want something both vibrant and structurally unique in their summer garden.