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.
The general way is to plant it about 2 feet apart each way, and then to lift and lay it in autumn. I find it stands far better when planted 4 feet between the rows, and 3 feet between the plants in the rows; in this way the plants get more air and light, and consequently do not become drawn and tender, and, of course, they are in a condition better fitted to stand severe frost. Crops of Lettuce, Spinach, etc, can be grown between the rows, so that the ground is not wasted. Alexander Gibson.
Edmonston Gardens, Liberton.