Sedum telephium 39purple emperor39 is a particularly stylish sedum with succulent burgundy45black foliage that adds a touch of drama to the front of borders purple emperor produces wide panicles of ruby45red flowers in late summer which persist well into autumn these striking blooms provide a useful source of nectar for pollinating insects and are much loved by butterflies a superb hardy perennial this variety holds an rhs agm for its garden performance and makes an excelle