Purple fountain grass (Pennisetum setaceum 'Rubrum')
Growing 5 feet tall and wide, its soft, feathery flower heads sway in the slightest breeze.
Cardoon
An artichoke relative (obvious when you look at the two plants side by side), this has edible stems and thistle-like flowers. But most people grow it for its architectural good looks. It gets very tall (to 12 feet) in the Northwest. Do not plant in mild-winter climates, where it has become an invasive weed.
