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 araceae arum flower lilies nature petal pollen spathes stamen white yellow zantedeschia arum lily bloom calla calla lily callas floral garden green leaves lily pink amaryllis family Arum family flowering plant Galanthus Grün Leucojum plant schneeglöckchen snowdrop spring summer snowflake vernum weiß wildflower