It's revealed that Harry smells Treacle Tart, Broomstick Handle, and Ginny (something flowery that he thought he might have smelled at the Burrow). I picked Cream for the treacle tart because treacle tart is often served with cream. Also some people stated that the cream smelled like maple syrup and treacle tart is made with syrup. I picked Hazelnut for the broomstick handle. I felt a nut would be closest to a woodsy smell. I picked Cherry Green for Ginny. I almost picked Summer Rose, but didn't want them to be overpowering, and Cherry Green has rose petals so I went with that. I thought cream and cherry would work well. Plus Ginny is sweet and so are cherries.