all-weather-space bark branched branches caudex conservatory deciduous display displayed distinctive dome dormant dorstenia-gigas exotics flower-dome gardens Gardens-by-the-Bay glasshouse gnarled greenhouse grotesque horticultural horticulture indoors moraceae ornamental pachycaul-shrub plants shape shaped shapes Singapore Socotran-fig-tree succulent surface surfaces texture textures tree trunk unusual utilitarian vegetation Apocynaceae caudiciform-plant fat-twisted-roots fockea-edulis ground-level Hottentot-bread semi-deciduous South-Africa-native vine-branches bottle-shaped bottle-tree ceiba-chodatii floss-silk-tree inside palo-borracho South-American stored-water subtropical swollen-trunk tropical warty-tree angled angles atmospheric-humidity botanical-gardens cloud-forest columnless-glasshouse conservatories conservatory-complex construction controlled- temperature cooling curved curves curving domes energy-efficient glass heating high-tech hothouse indoor-gardens light lighting optimized-conditions regulated-climatic-conditions steel structure sustainable-building-technologies transparent ventilation visibility warm-growing-environment windows