Echeveria imbricata 'Blue Rose' is an evergreen succulent native to Mexico and has one of the most perfect rosettes with fleshy saucer shaped leaves.    If grown under ideal condition, the tight rosettes can become as large as a dinner plate (4-6 in. wide), and can produce multiple offsets that hug the mother rosette at the base. Besides its attractive appearance, Echeveria imbricata 'Blue Rose' is also very popular thanks to its hardiness. It can tolerate temperature as low as 25 F (-3 C).    They have red or pink branch flowers in spring or summer.