I'm looking for a small tree or shrub recommendation for the bed on the side of my driveway. I live in Providence, RI (zone 6, maybe zone 7 since we're in the middle of the heat island that is our city.) The bed is ~2 & 1/2' wide by ~25 feet long, raised, in full sun and has good (perhaps somewhat acid) soil. I'm looking for something that'll give us some privacy from our neighbors: I think that means evergreen or something deciduous with a dense branching structure, and grows to at least 8' (as large as 20'.)

I'd also love something that flowers: Elderberries might work there but I'm not sure if it fits the description (bonus re: this plant, I can make wine from the fruit and, *double bonus*, it's native to RI.) What I definitely don't like is juniper/arborvitae/hemlock/cypress. As far as I'm concerned those plants just sit there and do nothing. C'mon, do *something* to entertain me, *plant*. At least have foliage that changes, or flowers, etc.

It would also be helpful to be able to hedge/train/prune the plant into an upright form so our car can get by.

What would you suggest!?