Hydrangeas are beloved for their spectacular blooms, but beyond the classic pinks and blues lies a fascinating world of unusual and unexpected colors. Here’s your florist guide to the most extraordinary hues these versatile shrubs can produce.
The Color-Changing Chameleons
Lime Green to Chartreuse Some varieties like ‘Limelight’ (H. paniculata) start with electric lime-green blooms that mature into creamy whites tinged with pink. The ‘Little Lime’ offers the same show in a compact form. These acidic greens are particularly striking in late summer gardens and create stunning dried arrangements.
True Green Hydrangeas The ‘Annabelle’ smooth hydrangea occasionally produces pure green blooms, especially when grown in shade. The Japanese mountain hydrangea ‘Oamacha’ displays soft green flowers with an almost translucent quality.
The Dark and Dramatic
Deep Purple to Black While most hydrangeas hover in the pink-to-blue spectrum, certain varieties push into gothic territory. ‘Black Steel’ (H. macrophylla) produces blooms so deeply pigmented they appear nearly black in certain lights, with dark purple undertones. The variety ‘Ayesha’ can achieve similar dramatic depths when grown in very acidic soil.
Burgundy and Wine As ‘Incrediball Blush’ ages, its pink blooms deepen into rich burgundy tones. The oakleaf hydrangea ‘Ruby Slippers’ transitions from white to deep rose-burgundy, complementing its dramatic fall foliage.
The Multicolored Marvels
Antique and Vintage Tones Many hydrangeas develop complex “antique” colors as they age—combinations of mauve, dusty rose, sage green, and taupe that look like they’ve been lifted from a vintage painting. Varieties like ‘Endless Summer Blushing Bride’ and ‘Zorro’ are particularly known for these sophisticated, weathered hues.
Picotee and Bicolors The ‘Hovaria’ series features flowers with contrasting edges—white centers with pink or blue rims, creating a picotee effect. ‘Pistachio’ offers cream petals with green edges that shift to pink as they mature.
The Rare and Unexpected
Orange Tints While true orange is extremely rare in hydrangeas, ‘Pistachio’ can develop peachy-orange tones in certain conditions, and some aging pink varieties take on coral or salmon hues in full sun.
Metallic Sheens Certain lacecap varieties like ‘Blue Deckle’ develop an almost metallic, silvery-blue appearance, particularly when the light catches them at dusk. The cultivar ‘Silver Lining’ lives up to its name with flowers that shimmer with pewter undertones.
Chocolate and Coffee As ‘Little Honey’ oakleaf hydrangeas fade, they can develop rich chocolate-brown tones mixed with cream—unusual for any flowering shrub. Similarly, some dried H. quercifolia blooms turn café-au-lait brown while retaining their structure.
Understanding the Color Chemistry
The secret behind hydrangea colors lies in soil pH and aluminum availability:
- Acidic soil (pH 5.5 or below) produces blues and purples
- Alkaline soil (pH 6.5 or above) yields pinks and reds
- Neutral soil creates purple or a mix of both colors
- White hydrangeas remain largely unaffected by pH
The most unusual colors often result from:
- Soil that’s neither strongly acidic nor alkaline
- Fluctuating pH levels throughout the season
- The natural aging process of blooms
- Specific light conditions or stress factors
Cultivating Unusual Colors
To encourage the most dramatic and unusual hues:
Experiment with pH: Gradually adjust soil chemistry rather than making dramatic changes. Mixed beds with varying pH levels can create multicolored displays on the same plant.
Embrace the fade: Don’t deadhead too quickly—some of the most unusual colors develop as flowers mature and dry on the plant.
Try shade: Deeper, more saturated colors often develop with some protection from harsh afternoon sun.
Consider variety: H. paniculata and H. quercifolia offer color ranges unavailable in the more common H. macrophylla types.
The beauty of hydrangeas lies not just in their individual colors, but in their transformative nature—a single bloom cluster can display half a dozen shades throughout its life, creating a living watercolor painting in your garden.