I believe that, ironically, many of the "natural" scents like Wet Garden and Dirt are made at least partially with synthetic components. As far as genuine EOs go, other earthy/gardenlike ones you could try are muhuhu, which smells like hay and sweaty horses, and amyris, a sandalwood substitute which I think doesn't smell like sandalwood at all but is very interesting in its own right. It has a very hay-and-wood-shaving smell. Patchouli from different countries also varies- from sweet to earthy. Same with vetiver.