Shade Loving Bergenia Produces Bell Shaped Blooms - Pigsqueak (Bergenia cordifolia) Also known as heartleaf bergenia, this ground cover perennial brings glossy evergreen leaves to the garden. Thick and leathery, the leaves squeak when rubbed, giving rise to the common name pigsqueak. Pink flowers appear in spring. Use pigsqueak in a woodland or shade garden. Hardy in zones 3 to 8.