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 removing young growing plants into larger sized pots, the roots should not be disturbed; indeed, they should be removed before the roots become so numerous as to spread round the sides of the pots. Any check now will throw them prematurely into flower, and thus partly defeat the object in view. For the same reason, watering must be regularly performed. The application of water is the most powerful controlling influence we possess in the artificial culture of plants. By limiting the supply, we can induce a state of rest, hasten the development of the flowering principle, and induce maturity of the wood, that will enable them the better to withstand the vicissitudes of winter.
Mignonette for early winter flowering may now be sown; prepare well-drained five-inch pots, by filling them with good, turfy soil, rather dry, and firmly pressed; sow the seeds on the surface, and, instead of covering, simply press them in. Set the pots in the shade, and keep moist; but be careful in watering after the plants appear, otherwise they will speedily disappear.
Pelargoniums that have been out down, will now be making fresh growths; as soon as these are about a couple of inches in length, the plants should be taken out of the pot, all the soil shaken from the roots, so that they may be pruned, then place them in as small pots as the roots will admit of, and again set them in a sheltered spot to grow.