brightly-coloured brown carpeting-plants clump-forming clumps color coloration colored colorful colors colour coloured colourful colours common contrast contrasting daisy-like drought-tolerant environmental-weed flower flowers garden-flowers gazania gazanias golden hardy introduced-species invasive low-growing perennial plants prolific rapid-spreader resilient roadside-weeds South-African streaked tough vivid water-wise weed widespread wind-blown-seeds winter yellow all-weather-space bark bottle-shaped bottle-tree branched ceiba-chodatii conservatory deciduous display displayed distinctive dome exotics floss-silk-tree flower-dome gardens Gardens-by-the-Bay glasshouse gnarled greenhouse grotesque horticultural horticulture indoors inside palo-borracho shape shaped shapes Singapore South-American stored-water subtropical surface surfaces swollen-trunk texture textures tree tropical trunk unusual utilitarian vegetation warty-tree garden-escape lance-shaped-leaves appearance garden flowers orange black