Ask anyone to name a smell and half of them will say rose. It is the most familiar scent in the world, the one flower everyone believes they already know. And it is a trick. The rose is the most distilled flower on earth, yet the single molecule that smells most of rose is water-soluble and runs off into the wash water, so the most precious rose oil is missing the very thing we mean by "rose." Meanwhile the flower's whole character rests on a group of molecules that make up less than one percent of the oil. The most familiar smell in the world is almost nobody's idea of what it actually is.

Not one rose. Two, and a queen in two tempers.

There are hundreds of rose species, but perfumery leans on two. Rosa × damascena, the Damask rose of Bulgaria, Turkey and Iran, is the one that is steam-distilled into rose otto: spicy, honeyed, deep, all heat and authority. Rosa × centifolia, the cabbage rose or Rose de Mai, grown above all around Grasse, is the one extracted into absolute: softer, fresher, more honeyed and tea-like, all light and grace. One rose brings the weight. The other brings the glow. Most great rose accords are a conversation between the two.

Unlike jasmine, which heat destroys, the rose can be distilled, and it is, more than any flower in the world. But distillation exacts a strange tax, and to understand rose you have to follow where its smell actually goes.

Where the smell escapes.

Steam a mass of rose petals and the oil lifts with the vapour, cools, and separates on top of the water as rose otto, the classic attar of the East. But the molecule most responsible for the honeyed, fresh, unmistakably rosy smell, phenylethyl alcohol, is soluble in water as well as oil, so most of it dissolves into the distillation water and never joins the oil at all. The otto that floats off is real and precious, but it is a rose with its most rose-like note largely removed: spicier, waxier, cooler, and famous for turning half-solid in a cool room. The smell you thought you were capturing has escaped into the rinse.

That rinse is rose water, and it is not waste. It is saturated with the very phenylethyl alcohol the oil could not hold, which is exactly why rose water smells so honestly of rose. The third road avoids the water entirely: wash the petals in solvent instead of steaming them, and you get rose absolute, a deep red liquid that keeps the phenylethyl alcohol and reads far closer to the living flower, richer and jammier, if less crystalline than otto. One flower, three materials, and the truest of them is the one distillation throws away.

"We distil the rose more than any flower on earth, and pour her best note down the drain as rinse."

Damascena, centifolia, and the apothecary's rose.

Terroir is everything.

Here is the quiet truth beneath the famous names: almost all of the world's great roses are the same species, Rosa × damascena, wearing the name of the ground that grows it. Taif, Kazanlak, Isparta and Kashan are not different flowers but different terroirs, and in rose, terroir is the whole story. The one true outsider is Rose de Mai, which is centifolia. Species is one question, place is another.

A trace that carries the whole flower.

The bulk of rose oil is simple enough. Citronellol, the most abundant molecule, near a third of the Damask oil, gives the fresh rosy body; geraniol and nerol extend it, sweet and clean; phenylethyl alcohol supplies the honeyed heart, when it survives; and rose oxide, though a fraction of a percent, throws off a sharp, green, almost metallic sparkle at the top that the nose reads instantly as fresh-cut rose. There is also an odourless part: stearoptene, a waxy paraffin that carries no smell at all but makes true rose otto congeal into a soft solid when cool, which is how the material announces it is real.

And then there are the rose ketones. Beta-damascenone and its relatives, formed as the flower's carotenoid pigments break down, make up less than one percent of the oil, yet they account for more than ninety percent of what your nose calls "rose." Beta-damascenone is detectable at a few parts per billion, one of the most powerful odorants known, which is why its presence is used as a marker of a rose oil's quality. This is rose's great paradox and the twin of jasmine's indole: the smell of the flower does not live in the molecules that fill the bottle, but in a trace almost too small to weigh.

A tonne of petals for a bottle of oil.

Rose otto is priced like the precious thing it is, and the arithmetic explains why. The Damask rose blooms for only three or four weeks from the third week of May, and the flowers must be picked by hand at sunrise, when the oil is at its peak, and gathered before the morning sun burns it off, ideally finished by ten o'clock while the dew still holds. Then the yield falls away.

It takes something on the order of three thousand to three and a half thousand kilograms of blossom, well over a million flowers, to distil a single kilogram of rose otto, and the white Alba rose needs more still. Absolute yields more from the same weight, which is why it costs less than otto despite smelling, to many noses, more like the flower. A harvest that lasts three weeks a year, a picking that races the sunrise, an oil measured out in grams. The rose is common in the garden and rare in the bottle.

What it actually smells like.

Otto and absolute are two different roses. Rose otto is warm, spicy and honeyed, with a waxy, almost tea-like depth and a clove-like glow, drier and more transparent, the rose of ceremony and of the East. Rose absolute is deeper and darker, jammy and wine-red, closer to burying your face in the living flower, sweeter and more sensual. Over both plays the green metallic sparkle of rose oxide and, underneath, the fruity plum-and-apple hum of the rose ketones. Real rose is never only pretty; there is spice in it, and a little rot-sweet fruit, which is what keeps it from ever smelling like air freshener.

The other flower perfumery cannot do without.

If jasmine is one of the two flowers fine perfumery is built on, rose is the other, and it appears even more widely. It is the heart of Nombre Noir and of Yves Saint Laurent's Paris, the towering overdose of Frédéric Malle's Portrait of a Lady, the airy sparkle of Guerlain's Nahéma, the incense-rose of Amouage's Lyric. It carries the great Middle Eastern rose-and-oud pairings and the fabled Taif rose of Saudi Arabia; it steadies countless chypres, where rose over oakmoss is a classic spine; and it turns up, quietly, in men's fragrance as often as women's. Rose is not a note so much as a language the whole art speaks.

A flower older than perfume.

The rose has been strewn, worn, burned and drunk for as long as there have been cities. Romans buried banquets under drifts of petals and shipped them from Egypt in winter; Persian poets made the rose and the nightingale, gol o bolbol, the central image of all longing; the Mughal and Ottoman courts scented water, sherbet and skin with it. Yet for most of that history there was no rose oil at all, only rose water, because no one had thought to keep the film of oil that floated on its surface.

The oil, so the story goes, was found by accident. At the Mughal court in the early seventeenth century, during a wedding feast in the reign of the emperor Jahangir, the garden canals were filled with rose water, and in the heat an oily sheen gathered on top. Skimmed and smelled, it proved to be the concentrated soul of the flower. Whether or not the tale is exact, rose otto spread out of Persia and India through the Ottoman world and into the Balkans, where the Bulgarian Valley of Roses became its European home, while Grasse turned instead to the centifolia and to solvent.

The last chapter is surprisingly recent. For centuries no one could explain why rose smells of rose, since its most abundant molecules, citronellol and geraniol, are only vaguely rosy on their own. The answer came in the early 1970s, when chemists at Firmenich isolated the rose ketones and realised that beta-damascenone, present in the faintest trace, carried most of the scent. A flower humanity had used for four thousand years was, only then, finally understood.

The most sacred, and most edible, flower.

No other scent crosses so many thresholds. In Islam the rose is ward: rose water washes the Kaaba in Mecca, cools worshippers in the mosque, and the twice-distilled golab of Kashan is poured at shrines. In Christianity the rose became the flower of the Virgin and gave the rosary its name, a garland of roses counted in prayer, while the Romans hung a rose above the table to mean that whatever was said beneath it stayed secret, sub rosa.

And then you eat it. Rose water and rose petals run through the sweet kitchens of half the world: Persian and Indian gulkand, Turkish delight, baklava, marzipan, rose lassi, the quiet rose in a good ras malai. The very molecule that makes a perfume precious makes a dessert taste of somewhere older and further away. Few materials are at once this holy and this delicious.

When the rose stopped being a woman.

For most of the twentieth century, rose in perfumery meant powder, romance and femininity. That has broken. Perfumers learned to drag the rose toward the earth and even toward decay, using geosmin, the molecule of wet soil and beetroot, to plant the flower in mud; Frédéric Malle's Une Rose famously sets its bloom in something close to truffle and red wine. The wine-dark, spicy, almost bloody rose became a signature of niche perfumery.

At the same time the rose slipped its gender. Paired with leather, incense and smoke, it gave men some of the most admired fragrances of the last twenty years, and a full rose renaissance took hold, treating the oldest note in the book as the most modern material on the shelf. The flower everyone assumed they knew turned out to have been waiting, all along, to be read a different way.

What is really in your "rose."

Rose is one of the most reconstructed smells in all of perfumery, and one of the easiest to fake convincingly, because its main players are cheap and available: phenylethyl alcohol, citronellol, geraniol, a whisper of rose oxide for the sparkle and a few parts of a rose ketone for the soul. A believable rose can be built without a single petal, and most are. There is no dishonour in it; it is how rose reaches a supermarket bottle. But when a perfume leans on true otto or a real absolute, you are smelling something no reconstruction quite equals, a flower with all of its spice, its wax, its plum-dark fruit and its faint, living imperfection intact.

There is a quieter constraint too. Three of rose's own core molecules, citronellol, geraniol and eugenol, sit on the regulated list of fragrance allergens and are capped at low levels in finished perfume. A composition that leans hard on natural rose runs straight into those ceilings, which is one more reason the modern "rose" is so often rebuilt from a few permitted parts rather than poured whole from the flower.

"The rose is how we have always spoken to the dead: petals on the grave, and the smell of remembering."

At HoM Haute we are drawn to rose for the obvious reason and a closer one. The obvious reason is that no material is so central, so endlessly workable, so unarguably beautiful. The closer reason is memory. In Indonesia the rose, mawar, is the flower of remembrance: red and white petals scattered over graves in tabur bunga when families return to sit with their dead, folded into the seven-flower kembang setaman for ritual baths and blessings, its scent carried through every threshold of grief and beginning. It is a flower this country reaches for precisely when it wants to remember. For a house built on the belief that fragrance is memory, the rose is not a note. It is the thesis.

Where we have used it.