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 beach builders' rubble coast coastline dumped growing growth layers levels low tide mangroves natural ocean outcrop pebbles pollution receding tide rock formations rocks rocky rough rubble sand sea seashore seaside shade shadows shapes shore shoreline Sizes stones stony sunlight sunshine tidal tides variety waste water waterline