This section is from the book "The Gardener V1", 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 well-managed gardens, where there is a great demand for forced flowers especially, the wall-borders are made to play an important part in the preparation of the plants for that purpose. Very much depends upon this preparation. Not only will they be much improved by being planted, or, in some cases, merely plunged, and the roots encouraged to ramble through the pots; but much labour, in the shape of innumerable waterings, will be saved. In some gardens a good piece of ground may often be seen either unoccupied after the first crop, or else cropped with some kind of vegetable that might with advantage be grown elsewhere; while, at the same time, in frame ground, numbers of Callas, Deutzias, Solanums, Capsicums, Eupa-toriums, and other serviceable kinds of flowers, may be seen in a semi-starved state in pots. Those who are in the habit of thus treating their plants, I advise to try the effects of a more liberal treatment, which I will endeavour to briefly detail, commencing with.