The petrichor fragrance trend that has taken hold this summer connects modern perfumery to one of the oldest scent-making traditions on earth: the distillation of kiln-baked clay and sandalwood oil in Kannauj, a town about 250 miles northwest of Delhi that has been producing mitti attar for centuries. Online searches for petrichor fragrances have surged by 94.4% since last year, according to market research platform Spate Data, and the reasons reach far beyond a passing aesthetic.
Kannauj: Where the Petrichor Fragrance Trend Has Its Oldest Roots
Mitti attar, the Kannauj elixir that captures the smell of rain on dry soil, is not a curiosity for niche collectors. According to Attar Kannauj, the practice of extracting natural perfume oils and attars from flowers, herbs and spices in India is more than 5,000 years old, making it one of the longest-running aromatic traditions anywhere in the world. The craft has since earned formal recognition: Kannauj Perfume holds a Geographical Indication under the GI Act 1999, listed as item 157 of the GI Act passed by the Government of India, protecting the designation under the Agreement on Trade-Related Aspects of Intellectual Property Rights. That kind of institutional anchoring puts mitti attar in the same protected category as Champagne or Darjeeling tea.
Petrichor itself is the humid, faintly metallic smell of moisture meeting parched earth at the start of a rainstorm. The word was coined in 1964 by Australian researchers Joy Bear and Richard Grenfell Thomas, drawing on the Greek petra (stone) and ichor (the blood of the gods). The following year, scientists isolated geosmin, the specific molecule behind that wet-earth smell, which is also present in raw beets and freshly turned soil. The human nose can detect geosmin at levels as low as a few parts per trillion.
Why the Smell of Rain Is Everywhere in Perfumery Right Now
Steven Gontarski, senior brand manager for niche fragrance retailer Luckyscent, is seeing customer requests for petrichor notes climb alongside interest in mushrooms, oysters and pollen. ‘Everyone has memories of petrichor,’ he says. ‘Summer vacation when you were a kid, or going on a road trip and getting caught in the rain. It’s nostalgic, and many of us are feeling a desire to go back to a more comforting time.’ He attributes part of the pull to what he calls the ‘touch grass’ notion: ‘We get so wrapped up in the digital world that we lose sight of the fact that we’re actually mammals living on Earth.’
The scent is not simple to recreate. Petrichor forms when microbes living in soil and rocks are released by the impact of raindrops, combined with organic compounds emitted by plants and amplified by moisture. It tends to emerge when the earth is especially dry, which is why it does not follow every shower and why it carries that elusive quality. The first synthetic geosmin note became commercially available in the early 2000s, but perfumers quickly found that geosmin can skew musty with too heavy a hand. Many opt instead to build the effect with vetiver’s grassy aroma, patchouli’s loamy depth, or marine notes and aldehydes to suggest electricity-charged air and thirsty ground.
Douglas Little, perfumer and founder of Heretic, reaches for petrichor-evoking notes consistently across his work. ‘Petrichor is the smell of the earth exhaling,’ he says. ‘It’s not really rain. It’s what rain awakens. Dry soil, cracked roots, stone, moss, mineral dust, and microscopic life. There is something almost prehistoric about it.’ His new Ghost Stories collection runs petrichor as a thread through five scents conceived as olfactory apparitions: liminal spaces like abandoned gardens and misty forests. In Shadow People, the mineral note of geosmin collides with oakmoss and musk to produce something Little describes as almost three-dimensional.
D.S. & Durga cofounder and perfumer David Seth Moltz, who has used petrichor across several compositions including Concrete After Lightning and Big Sur After Rain, frames the appeal plainly: ‘Petrichor adds realness to a composition. It makes your perfume seem like you are actually in a space like a forest or by the water, not in a fantasy world just based on those places.’
Kevin Keller, founder and perfumer of Fulton & Roark, drew directly on mitti attar when creating Cloudland, a scent inspired by a hike cut short by a rainstorm. For Nonfiction’s Tears In Rain, perfumer Yann Vasnier combined herbaceous geranium with moss and vetiver. Demeter Fragrance Library CEO and chief perfumer Mark Crames, who says he was inspired by ‘the multitude of ways that J.M.W. Turner could paint light,’ has produced both a Petrichor and a Thunderstorm that sit at the photorealistic end of the spectrum.
‘There is melancholy in it, but also hope,’ says Little. ‘It suggests transformation, the charged moment before growth begins. It is the smell of life returning.’ With autumn approaching and the ground still parched across much of the country, that particular promise is exactly what a lot of people seem to want to carry with them.
