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.
A magnificent Bellflower from Turkestan, 4-5 ft. high. It has large tuberous, Parsnip-like roots, circles of toothed leaves, and beautiful, bell-shaped flowers up to 4 in. across, white stained with lilac-purple and deeper veins (fig. 230). This noble plant is quite hardy in most parts of the kingdom, and may be raised from seeds sown in cold frames or in a warm greenhouse. Owing to the great roots it is necessary to have the soil deeply dug and well manured to secure the best results.
Fig. 230. - Ostrowskya magnifica.