appearance black brightly-coloured carpeting-plants clump-forming clumps color coloration colored colorful colors colour coloured colourful colours common daisy-like drought-tolerant environmental-weed flower flowers garden flowers garden-escape gazania gazanias golden hardy introduced-species invasive lance-shaped-leaves low-growing orange perennial plants prolific rapid-spreader resilient roadside-weeds South-African streaked tough vivid water-wise weed widespread wind-blown-seeds yellow Australian coral tree brittle branches curved petals deciduous dicotyledonous erythrina erythrina x sykesii fabaceae finger-like flora hybrid long petals non-seeding pest scarlet flowers sterile hybrid tall tree thorny tolerant tri-foliolate tubular petals upward-pointing radial pattern vigorous vigorously growing tree alien black-flag black-flag-iris blooms bright budding buds bush bush-plant coloring colouring display displayed ferraria-crispa ferraria-undulata foliage greenery iris-family leaves malodorous-cormous-perennial mixed nature nectar shape shapes Sizes spring strange unusual unusual-shapes Western-Australia agricultural-pest arum-lilies arum-lily bushland calla-lily childsiana death-lily declared-pest dense-clumps funeral-flower green-goddess herbaceous introduced lifestock-threat lily-of-the-Nile out-of-control pasture-invader pig-lily spreading St-Joseph's-lily surface surfaces surfacing texture textured textures thick-fleshy-leaf-blades toxic varkblom white-arum-lily zantedeschia-aethiopica