This section is from the book "The Gardener V2", by William Thomson. Also available from Amazon: The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener.
In many gardens the stock of these is ever increasing, and the knowledge of this must be gratifying to all ardent Rose-growers - as of all Roses, I think there are none so valuable as those gathered under glass in January, February, March, and April. By care in pruning and attention to selection, Roses in these months may easily be obtained by all who can keep any glass structure from 40° to 60° during the time specified. H. P. pot-Roses must be pruned on the same system as the same kinds out of doors, to regulate the time of blooming and the distribution of the shoots. If wanted to bloom in February or March, we would prune in October or November; if in April or May, January would do. Teas planted out and in pots may be treated differently; many of them continue flowering all the year through, if they can be induced to make fresh wood to supply the blooms, and the way to accomplish this is to keep pruning at them every month of the year. When one bud or cluster of flowers has faded or been otherwise removed, the shoot which bore it should be shortened back a little way, but leaving a number of buds, which will soon sprout again, run into branches, and form buds and flowers, to be reproduced by a repetition of the same operations.