appearance bell-shaped biennials blooming blooms clump-forming colored colorful colors coloured colourful colours cultivars decorative Digitalis display distinctive downward-facing erect exotics flora floral flower-spikes flowers foxglove garden garden-flowers garden-plants herbaceous horticultural horticulture light mottled nature ornamental perennials petals plants potent-glycosides shape shaped shapes tall-spikes textures toxic toxicity tubular unusual whorls all-weather-space Apocynaceae bark caudex caudiciform-plant conservatory displayed dome fat-twisted-roots flower-dome fockea-edulis gardens Gardens-by-the-Bay glasshouse gnarled greenhouse grotesque ground-level Hottentot-bread indoors semi-deciduous Singapore South-Africa-native succulent surface surfaces texture tree trunk utilitarian vegetation vine-branches bottle-shaped bottle-tree branched ceiba-chodatii deciduous floss-silk-tree inside palo-borracho South-American stored-water subtropical swollen-trunk tropical warty-tree Australian bush bush plant cap caps capsule clusters conical dry eucalypts green honky nuts leaves native natural natural coloring natural colouring plant seed pods strange trees unusual shape ghost gums ghostly white bloom buds crimson evergreen golden pink red stamen tipped tips yellow