Also known as purple giant hyssop. Chartreuse, golden foliage and heavy scent makes this an award winning perennial.. This easy, adaptable perennial is attractive to pollinators and makes a lovely anise flavored tea. The purple blooms add brush strokes of color to the perennial border all summer long. Plants average 2 feet tall and will be covered in oodles of butterflies and bees; goldfinches also love the seeds.