Sedum Herbstfreude (Autumn Joy)

'Herbstfreude' is a herbaceous perennial forming a clump to 60cm in height. It's probably one of the best of all border sedums;  vigorous, hardy, carefree and good-looking.  It has fleshy,  oblong, glaucous green leaves and large flat terminal clusters of starry flowers in early autumn. The flowers open from greenish-pink buds, rapidly progressing through pale pink to become deep pink and ultimately taking on a brownish hue.