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.
This is still grown, but not in such large numbers as formerly. It is a native of Madagascar and has erect green stems with whorls of flattish bright-green leaves, which are narrower in the variety rigidus, The plants may be raised from seeds sown in a stove temperature and in rich loamy soil; and also by dividing the old clumps into pieces. The plants are chiefly used for furnishing and decoration. There is a variegated kind but it is rarely grown. Another species, G. laxus, is grown for market also. It is ornamental in appearance, but somewhat looser in habit than the first-named. There is also a variegated form of it. Plants in 5-in. pots (48's) fetch from 4s. to 6s. per dozen in market.