Perennial.
The herb became known as Our Lady's Mantle because the scalloped shape of the leaves, were thought to resemble the mantle (cloak) of the Virgin Mary. Later, politics intervened, and the "Our" was taken from the name. It will grow from 6 inches for the alpine variety to about 12-18 inches on the others. Space about 12 inches between plants. Lady's Mantle needs a fertile soil and some moisture-more than the standard herbs. It can be in full sun in northern climates, but can tolerate some shade and in the warm climates prefers it.