When a broken stump, such as is here shown, has to be sawn off, the proper place to amputate it is from A to B; the wrong place from C to D.
Branches or snags that have to be removed should be sawn off quite close to the trunk or larger branch from which they spring. When a stump, even not more than a few inches long, is left, the new bark and wood are unable to close over it, and the wood ultimately decays and acts as a medium for moisture and fungoid diseases. The saw should travel from point A to B, as in the sketch. When a stump is left (as would be done by sawing off at C D) decay sets in sooner or later. Although the tree often succeeds in healing over the dead part, it more often fails to do so until the decay has reached the trunk itself. With the softer-wooded trees like the Horse-Chestnuts disease frequently reaches the heart of the tree quickly by these means. A coating of liquid tar over the wound, renewed once or twice until the new bark has closed over, is a sure protection against these evils.
A good deal may be done in the early training of a tree to so control its building up that it may best withstand the violence of gales. And the most important matter in this connexion is the development of a strong erect trunk, a central axis of such height and strength and bulk as to be capable of supporting its head of branches easily. In other words the leading shoot should always be watched, and, by the repression of any rival leaders that may appear, allowed to retain its predominance. In the best English nurseries only trees with good "leads" are sent out.
Trees decayed in the centre, with only an outer layer of healthy wood, are, of course, doomed, but by filling up all holes in the earlier stages of decay, and thus keeping out moisture, their term of life can be lengthened by many years.
Holes made by woodpeckers can sometimes be plugged up with a piece of Oak. This, if left on a level with the bark, will often enable the latter to close over the hole. Large holes may be filled with cement, or even built up with bricks, the surface being made water-tight and tarred over.
CHAPTER XVIII
TREES AND SHRUBS FOR WATERSIDE
Many of the brightest garden pictures at the present day are by the well-planted pond or lakeside, where shrubs of large growth are grouped to give colour through summer and winter.