A striking hardy perennial brunnera macrophylla 39jack frost39 produces large heart45shaped silvery leaves with green veins in mid to late spring these are complimented by delicate sprays of blue forget45me45not like flowers happiest in a shady position siberian bugloss is perfect for woodland gardens or the front of shady borders where it will slowly spread to form a dense colourful ground cover height 45cm 40183441 spread 60cm 40243441