If you grow orchids in a tropical garden, you might have noticed a pattern. Many of them, from dendrobiums to vandas and phalaenopsis, bloom in shades of purple.
Four years ago, I brought home a Phalaenopsis orchid without knowing much about orchids. I kept it in a shaded part of my garden, exposed to rain, and it has rebloomed faithfully every year. It even rebloomed from the same flower spikes.
The colour of its flowers wasn’t just purple, it was magenta, a brighter, more saturated shade of purple.
So, in this article, we’ll explore what makes purple orchids special and why they are more common than other colours.
1. Purple attracts the right pollinators
Orchids rely on insects, such as bees, butterflies, and moths, for pollination. Bees are strongly associated with purple and violet flowers, and studies show they often display an innate preference for these colours when foraging.
To a bee, a purple orchid is not subtle. It stands out clearly against green foliage, making it easier to find in a dense garden.
Even when other colours are present, purple seems to be painted or splashed on the petals, attracting the bee to where it matters most to the orchid.
2. Purple mimics the promise of nectar
Some orchids produce nectar, but many do not. Instead, they rely on visual cues to attract pollinators.
Purple orchids often resemble nectar-rich flowers that insects already recognise. This encourages pollinators to visit, even when there is no reward. It is a clever survival strategy that allows orchids to conserve energy while still reproducing.
By contrast, the colour red, which is so striking in other tropical flowers, appears less often in orchids because their primary pollinators do not respond strongly to it.
3. The colour purple is easy for plants to produce
The purple tones in orchids come from natural pigments called anthocyanins, which are common in many flowers, fruits, and tubers.
Anthocyanins appear red under acidic conditions and blue under more alkaline conditions
Anthocyanins are stored in the vacuoles within the plant cells. The conditions in most plant cells are slightly acidic, not strongly acidic or alkaline. This naturally pushes colour expression towards purple, right in the middle between red and blue.
4. Blue is actually difficult to produce
True blue flowers are rare. To produce blue, plants often need more alkaline conditions in their cells, specific metal ions (iron, aluminium or magnesium), and co-pigments that stabilise the blue tone.
Perhaps this is why blue flowers have long carried a sense of longing. In literature, blue roses are often used to symbolise the unattainable, a desire that cannot quite be fulfilled. In Rudyard Kipling’s poem, “Blue Roses”, they take on this meaning.
So, blue is not a colour choice for orchids. And that’s why many “blue orchids” you see in shops are dyed. A friend once fell for this when she bought a “blue” Phalaenopsis. It turned out to be white and promptly died of embarrassment.
5. Nature repeats what works
Over time, orchids that successfully attract pollinators are more likely to reproduce. As a result, effective traits, such as purple flowers, are passed on from one generation to the next.
This is why you see similar colours across orchid genera, even though they are not closely related.
6. Purple Sells
If you visit orchid nurseries or browse online stores, you’ll notice that purple, magenta, and pink dominate the catalogue.
This is because breeders often get more predictable results when working with purple tones. The purple traits are genetically stable and easier to reproduce across hybrids.
Purple anthocyanins produce a wider range of tones, which allows breeders to create orchid flowers from soft lavender to deep wine or almost black orchids.
Not only are they easier to reproduce, but purple orchids tend to perform well. They bloom, they rebloom, and they endure conditions that might unsettle more delicate varieties.
This has been my experience with my first Phalaenopsis orchid, which gave me confidence with orchids. Last year, while blooming, when the crown began to rot for some reason, it did not collapse. It adapted and produced offsets.
For commercial reasons, hybrids tend to be selected for repeat blooming and durability.
And then there is the human response. Purple holds the eye and draws people in. I once watched, with fascination, an orchid lover make a beeline for a purple Vanda orchid beside me in a plant market.
We immediately got acquainted, and I went to film her garden a few days later. In her words, the orchid was “delightful and exotic”. You can watch the video here.
And not only are purple orchids delightful, rich, exotic, and luxurious, but they also come out beautifully in photographs — an important quality for online sales.
And there you have it. Purple orchids are not just beautiful; they are efficient. The colour helps them get noticed, attract pollinators, and thrive in the environments where they grow.
The orchid that built my confidence was a shade of purple. I hope this article gives you the confidence to bring orchids into your garden if you haven’t done so yet.
Read more about styling with orchids.
Thanks for reading.
