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 angles appearances contrast contrasting covered walkways decorative designed distinctive elements external ferns flora foliage garden green greenery leaves light peace peaceful perspectives quality shade shadows shapes shrubbery shrubs Sizes style styles sunlight sunshine trees variety views