I would like to pick up Dana09 suggestion, and start a discussion about fragrant and aromatic plants - one of the great pleasures of gardening for me. One of my personal favorites is Aesculus parviflora, a shrubby chestnut, increasing moderately (at least in my garden) by suckers. In early July it is covered in ephemeral flowers, resembling bottlebrushes. Almost never mentioned in literature is the delicious scent of these, which is wafting quite a distance through the garden. Other bonusses: the young unfurling leaves, starting off with a strong coppery tint, then displaying a fine bright green, before attainging their dark green summer colour. In autumn they are a clear yellow. Seeds look very much like normal chestnuts, their pod is smooth, a bit velvety. Height up to 3m, spread large when really old.