arum lily bloom calla calla lily callas floral flower garden green leaves lily pink stamen white yellow zantedeschia plant flowers lilium orange spring cala calas close-up closeup floral arrangement flower arrangement greenery lilies nature still life agricultural-pest arum-lilies arum-lily bush bushland calla-lily childsiana color colour death-lily declared-pest dense-clumps funeral-flower green-goddess herbaceous introduced invasive lifestock-threat lily-of-the-Nile out-of-control pasture-invader perennial pig-lily spreading St-Joseph's-lily surface surfaces surfacing texture textured textures thick-fleshy-leaf-blades toxic varkblom weed white-arum-lily zantedeschia-aethiopica