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 flower flowers Lantana nature plant plants blue garden green hortensia hydrangea pink bloom blossom blossoms bunches cascades climber clusters colorful colourful flora flowering plant fragrant gardening leaf leaves lilac mauve pendulous purple racemes scented spring tree vigorous vine vines violet wisteria wisteria plant bright petals red rosa rose summer display rhododendron showy shrub white Cornaceae cornus kousa Dogwood carmine natural syringa Adoxaceae ball Caprifoliaceae cultivar pompom Viburnum opulus England english Great Britain