Dennis Norgate was growing this plant when I first met him more than forty years ago. Achillea clypeolata is worth having for foliage effect alone as its evergreen mat of intense silvery grey, feathery leaves makes it one of the most telling of any of the silvers. During spring and summer flat plates of acid yellow flowers are carried on silver stems. This plant is happy in any sunny spot and can take dry garden conditions. 60cm x 60cm.