This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
Tuberoses were grown more extensively a few years ago than they are at the present day. They were very popular with florists, and thousands of bulbs were imported annually for forcing during the winter and early spring months, different batches being used to keep up a succession. The double-flowered variety known as "The Pearl" is the only one favoured by market growers, owing to its size and purity of colour. The bulbs are usually placed in 5-in. pots in sandy loam, with a little leaf soil or well-rotted manure. At first they are kept cool to get root action established, but afterwards they may be placed in a house with a night temperature of 65° to 75° F., to bring them quickly into bloom. The pots are often plunged in hotbeds up to the rim, and in this way there is a regular supply of moisture at the roots. In the spring months less artificial heat is required., as the sun gains in power, and during the summer months the plants can be grown in a cool house or even in the open air. The blooms are picked off the stems and tied up in dozens in little pieces of thin paper, and thus sold in market. The florists wire the blooms and use them in all kinds of ways for bouquets, wreaths, and other emblems. After strong forcing the bulbs are thrown away, and a fresh supply is imported from France or Holland in the autumn.