When I walked to middle school in San Francisco, in the Richmond District, more than half a century ago, I passed a wall of shrubs.
On mornings when the fog was heavy, about ten days a year during school, the wall of shrubs had a very powerful smell. A pleasant and unforgettable smell. I loved it.
About two years ago I passed a cluster of small shrubs while taking a walk with a friend, with low fog, out in the Sunset District. Same geographic relationship to the fog that exists in the Richmond District. The shrubs instantly matched my memory.
I picked a branch and took it to the nursery. They said it was a Rose of Sharon. So I bought one and planted it on my back deck. There is far less fog in San Francisco these days, less open space, and I live farther from the ocean fog. But there is occasional fog and I get to enjoy the smell memory of my childhood.
The Rose of Sharon is not a rose, it is an hibiscus.