Thalictrum or Chinese Meadow Rue
Are fantastic perennials that when in full flower they seem to hover over the heads of everything else. They are great at creating that nice airy feel especially if your border is packed with full flower heads.
Where to Site Your Thalictrum
With the plants getting quite tall it is more suited to the middle or back of the border, it doesn't need any support as it will rely on the other plants.
How to Grow and Look after Your Thalictrum
To plant meadow rue they do really well in light shade and reasonable shade, they don't like to be over crowded so make sure there is always room for them. In springtime, divide the clump, that way you get more plants and it keeps them happy as well.