Award-winner Sedum 'Herbstfreude' or 'Autumn Joy' in English is probably one of the best of all border sedums. Vigorous, hardy, carefree, good-looking, with a season of interest lasting more than 6 months from early summer until well into winter, who could resist? Easy to grow, this standout perennial forms a 2 feet tall and wide (60cm) clump of thick, fleshy blue-green foliage topped with flower buds resembling broccoli.