Plant has lacy, blue-green foliage with pale yellow flowers in summer.  Leaves are used in flavoring salads, cheese dishes and in teas to help relieve joint pain.  Use  leaves sparingly as they can be toxic and cause skin irritations to some people.  Also can be used to deter cats.  Is a good food source for caterpillars of swallowtail butterflies. It grows 24-30" tall by 12-18" wide in full sun to part shade in well drained soil.  Perennial zone 4-8.