This section is from the book "The Gardener V1", by William Thomson. Also available from Amazon: The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener.
A beautiful and interesting plant - an excellent subject for planting in shallow pools or bogs, but unfitted for deep water. It extends itself rapidly in quaggy or marshy ground that is always more or less moist, throwing out its creeping stems in all directions, rooting and establishing itself as it pushes out. The leaves, on short stout stalks, are broadly heart-shaped, terminating in an abruptly-attenuated point, and dark shining green. The spathe is pure white, the same in form as the leaves, but scarcely so broad; and they are flat, not cuccullate, as in the aethiopian Calla. The flowers appear in summer and autumn. Native of N. Europe and N. America. W. S.