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.
Pyrus Japonica is a far more coarse-growing plant than either of the above, and seldom can be made to show such a neat appearance; but when once well established, it sometimes has an interesting appearance. Where it is required to give a covering and a pleasing effect upon any wall, it would be far better to plant them pretty close together - say at about from 2 to 3 yards apart - thus requiring fewer branches trained off right and left, and consequently their natural vigour will carry them higher up the wall. Many others are very suitable when attended to by one who knows how to manage them.
The smaller-leaved and closer-growing plants are preferable to strong coarse-growing kinds, but in every case let them have suitable soils to grow in. Good drainage is very essential. G. Dawson.