Freshly dug garden dirt!
Exactly that, with the tiniest hint of something citrusy. I blind- bought a bottle of Demeter Dirt, when it was a new thing on the market. Then I blind-bought Earthworm, which didn’t react well on my skin. I smelled of mildew, a note I very much enjoy, just not as a single note scent. I like Dirt better. If you’re into gardening, and miss it during the Winter months, I recommend Dirt as a realistic-smelling reminder.