Polianthes tuberosa \'The Pearl\' Spikes of intensely fragrant, waxy white flowers are produced throughout summer, which make enthralling cut flowers. Often called the world?s most scented bulb. Polianthes tuberosa requires a minimum temperature of 15C (59F) so it is ideal for a heated greenhouse or conservatory. It can also be grown outdoors in containers or sheltered sunny borders, if it is lifted and stored frost-free over winter. Height: 120cm (48). Spread: 20cm (8).