2nd year maturity perennial seeds. Achillea Summer Pastels Mix seeds are brilliant, easy to grow, and renowned for their tolerance to thrive where other novelty plants can not. Summer Pastels Mix Achillea is an AAS Flower Winner for its hardiness and ability to bloom perennially for many years. Summer Pastels Mix seeds mature into fragrant 18-24 inch tall Achillea flowers, boasting lush 6 inch bushels of blooms, ideal for any decorative container. Achillea seeds grow the perfect trimming to any flower bed or as a fresh cut compliment to any next summertime bouquet.