This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
In order to produce strong blooming plauts in small pots early in February of this gem of the winter season, the offsets from stock-plants should be potted into 3-inch pots, or if seedlings they should have been pricked out into the same sized pot about the middle of August; and as seedlings grow quicker than offsets, they will bloom about the same time. The second week in September would be a good time for potting them into 4-inch, and the stronger plants into 5-inch pots, and in a month hence give them their final shift - the former into 6-inch, and the latter into 6-inch pots. The roots will quickly fill the pots, consequently they will require a plentiful supply of water, for if stinted in this respect while growing, they will lose the best of their foliage, on which their fine appearance so much depends, and what would have been flowering shoots will degenerate and become "broody" and be entirely worth-lew for blooming purposes. The soil I have found them thrive best in consisted of two-thirds good turfy loam, one-third rotten dung thoroughly decomposed, and a little rough sand; pot firmly, and drain the pots well, from first to last a good cool pit in a sunny aspect will both grow and bloom them. - R. M., in London Gardeners' Chronicle.
 
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