Corydalis flexuosa purple leaf39 is an attractive and unusual plant with ferny purple foliage tinged with red accompanied by tubular flowers in an eyecatching shade of blue this corydalis might look delicate but it is tough and enjoys our cool english summer weather corydalis will spread to form clumps in a shady corners or border and flowering can last from late spring into the middle of summer height 15cm 4063441 spread 50cm 40193441