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 agricultural-pest arum-lilies arum-lily bush 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 surfacing textured thick-fleshy-leaf-blades toxic varkblom white-arum-lily zantedeschia-aethiopica angled angles botanical-gardens clouds columnless-glasshouse conservatories conservatory-complex construction controlled- temperature curved curves curving domes energy-efficient foliage garden glass heating high-tech hothouse indoor-gardens light lighting optimized-conditions overcast palm-trees palms shrubbery shrubs steel structure sustainable-building-technologies transparent trees ventilation visibility warm-growing-environment windows abundant appearances castor-beans castor-oil castor-oil-plant castor-seeds cluster clusters cotyledons Euphorbiaceae fast-growing highly-toxic inflorescences large large-leaves leaf leaves medicinal palm-of-Christ palma-Christi poison poisonous ricinus-communis seed-pods seedhead shrub spiky-green-seed-capsule spiny toxins wasteland-weed