A group of shrubby or herbaceous plants with large tongue-shaped leaves of a glaucous color thickly covered with fine hairs. They bear immense spikes of blue, pink or white flowers, forming very striking objects in the shrubbery, their large gray leaves effectively contrasting with their bright-blue flowers. They grow well in any good garden soil.

Propagate by seeds sown one-sixteenth of an inch deep in the early Spring, or by cuttings placed in sand in a cold frame in October or November; grow them in pots for one year and plant them in the shrubbery the following Spring.