This plant appeared in my garden by itself. It grows on poor soil without any help from me. It is almost as tall as me, and its stems are very thick so it looks like a shrub. Trumpet-shaped flowers are noticable from afar and last long.
They say Calla lily (Bog Arum, Marsh Calla) in the U.S.A. grows best outdoors in zones from 7 to 10, and our zone is 7b. They like sandy, lightly acidic moist soil. Our soil is sand & rocks and it's acidic. It's not moist although, and there are no sprinklers in its part of the garden. Maybe, because of that, its rhizoms don't spread as typically happens near ponds and other moist areas. My plant just gets bigger every year and serves like a good focal point in my terrace bed.
Other plants in this picture are: grape, black currant, peony, euphorbia, daylily, weigela, forget-me-not, garlic, lilac, berberis, rose, eupatorium, etc.
***Copyright 2012 TatyanaS