Goat's Rue presents with beautiful clusters of bell-like flowers on upright stems and white hairs giving the plant a silvery appearance.  
Host plant for butterfly and moth larvae.
Height: 1-2 feet
Blooms pale yellow and rose May-August
Conditions: well-drained soil in full sun
Why the name?  Goat's rue was once fed to goats to increase milk production.
Photo: Bill Nicholls - geograph.org.uk/p/5051069