On Naval Timber and Arboriculture / With Critical Notes on Authors who have Recently Treated the Subject of Planting

by Patrick Matthew

NURSERIES.

Much of the luxuriance and size of timber depending upon the particular variety of the species, upon the treatment of the seed before sowing, and upon the treatment of the young plant, and as this fundamental subject is neither much attended to nor generally understood, we shall take it up ab initio.

The consequences are now being developed of our deplorable ignorance of, or inattention to, one of the most evident traits of natural history, that vegetables as well as animals are generally liable to an almost unlimited diversification, regulated by climate, soil, nourishment, and new commixture of already formed varieties. In those with which man is most intimate, and where his agency in throwing them from their natural locality and dispositions has brought out this power of diversification in stronger shades, it has been forced upon his notice, as in man himself, in the dog, horse, cow, sheep, poultry,—in the apple, {107} pear, plum, gooseberry, potato, pea, which sport in infinite varieties, differing considerably in size, colour, taste, firmness of texture, period of growth, almost in every recognisable quality. In all these kinds man is influencial in preventing deterioration, by careful selection of the largest or most valuable as breeders; but in timber trees the opposite course has been pursued. The large growing varieties being so long of coming to produce seed, that many plantations are cut down before they reach this maturity, the small growing and weakly varieties, known by early and extreme seeding, have been continually selected as reproductive stock, from the ease and conveniency with which their seed could be procured; and the husks of several kinds of these invariably kiln-dried[25], in order that the seeds might be the more easily extracted! May we, then, wonder that our plantations are occupied by a sickly short-lived puny race, incapable of supporting existence in situations where their own kind had formerly flourished—particularly evinced in the genus {108} Pinus, more particularly in the species Scots fir; so much inferior to those of Nature’s own rearing, where only the stronger, more hardy, soil-suited varieties can struggle forward to maturity and reproduction?

We say that the rural economist should pay as much regard to the breed or particular variety of his forest trees, as he does to that of his live stock of horses, cows, and sheep. That nurserymen should attest the variety of their timber plants, sowing no seeds but those gathered from the largest, most healthy, and luxuriant growing trees, abstaining from the seed of the prematurely productive, and also from that of the very aged and over-mature; as they, from animal analogy, may be expected to give an infirm progeny, subject to premature decay.

As, from many facts, a considerable influence is known to result in several vegetables from drying severely the seeds from whence they had sprung[26],—from exposure of these seeds to the sun and air,—from long keeping, or from injury by mould or {109} impure air, which all tend to shorten the life of the resulting individual, to accelerate the period of its seeding, and to increase its reproductiveness; the nurseryman should pay the utmost attention to the seeds he makes use of, procuring them as recent as possible, and preserving them in well-aired lofts, or under sheds, and also retaining them in the husks till the time of sowing: the superior germinating power of the seed thus treated will repay this attention.

From facts we are also assured, that, in some hard wood kinds, and also in the Coniferæ, the hanging of the growth of the young plant, the spindling up in the seed-bed, or injudicious deterring treatment afterwards, have a tendency to injure the constitution of the individual, inducing premature seeding, and diminutive old age; and also, that when plants, especially of some size, of these kinds of trees have their roots much broken, the secondary or new roots often partake something of the nature of the infirm runners, which, in most kinds of trees, are thrown out by layers,—the resulting tree, as in the case of those from layers in fruit trees being dwarfish, sooner exhausting itself by reproduction, and sooner decaying. For distinctness, we shall recapitulate: {110}

That the seed be from the largest, hardiest variety of tree in luxuriant growth.

That the seed be recent, and carefully preserved in husk till sowing, and extracted from the husk or cone without artificial drying.

That the nursery be in an open, rather exposed situation,—most eligible without shelter either of tree, hedge or wall, of rather light dry soil of ordinary quality, of dry climate, and, in preference, soil naturally good to that made so by high manuring.

That the plants be not too close, nor remain too long in the seed-bed; that they be extricated without much fracture of root, and be replanted in wide rows, with good space between the plants in the row, keeping the roots as superficially extended as they will thrive, and without doubling the main root up to the surface of the ground.

That the plant receive no pruning, excepting in the case of more than one leader appearing, or feeder unproportionally extended; and no root-section, in order to retard its growth, or increase the number of root-fibres; and that its ultimate removal be accomplished without much fracture of root or branch.

By exposed situation of nursery, ordinary quality of soil, and much room in the seed-bed and rows, we {111} shall have plants with firm fibre and hardy constitution, with thick juicy bark, thick stem at the surface of ground, and numerous feeders all the way down the stem. Roots are most easily extricated from light soil, and with least fracture. They are large in proportion to stem in dry soil and climate, and when they are situated near the surface of the ground.—A healthy growing plant, of firm fibre, large root, and sturdy short stem of one leader and numerous feeders, is the great desideratum: a large root is the more desirable, as a considerable part of it is generally broken off in transplanting, rendering it disproportioned to the top, which, in consequence, either languishes, or receives deterring cropping.

We consider, that a tree grows more luxuriantly, acquires larger size, and is much longer of reaching senility, when it is furnished with several large roots, say one or two to each of the cardinal points, extending horizontally out with bold leaders, than when numerous small rootlets diverge in all directions from the bulb, as is the case in some kinds when much fracture of root takes place from frequent removals, or, when the nursery is of moist or mossy soil, the plants being removed when of considerable size. We have cut down old stunted hard wood trees having extremely numerous crowded roots, all {112} engrafted into a matted net throughout the soil near the bulb, and without any strong extended leaders. We attributed this crowded rooting to the plants having been of considerable size when put in, and losing their natural leaders; the situation, an avenue exposed to cattle, went to confirm the probability that the defect of the rooting had been owing to the largeness of the plants.

When a tree is supplied by numerous, consequently small and not wide-extending roots, as the tree acquires size, the wide spreading branches and leafy top shed off the rain and dews from the space occupied by these roots, very few of them extending beyond this shade; at the same time, this narrow space becomes soon exhausted of the more particular pabulum necessary to the kind of plant, the exhaustion being accelerated by the dryness. This dryness and exhaustion of the soil very soon show their effects aloft; the living hark of the tree becomes covered from its connexion with the air, and constricted by a thick hard dead crust, which, with the consequent very thin alburnum affording an inefficient communication between the supply and demand, react to impair the general vigour, and particularly to impede the descent of the proper sap necessary to the enlargement and further extension of the roots. The buds {113} not receiving sufficient supply of root-moisture, instead of pressing on to new formation of wood, only find enough to burgeon out into flower-buds, which the following season drain the tree by reproduction; this fruit-bearing alternates with periods of exhaustion, when the buds have not even supply sufficient to swell into the embryo of flower and seed, but extend only into a few leaves; and sometimes, in the event of a benign season, the buds may throw out a small extension of new shoots. The tree progresses very slowly in thickness of bole all this time, and generally soon falls a prey to disease. On the other hand, when the tree has its naturally fine large roots preserved, and is situated in open forest, and mixed with other kinds, these large roots diverging widely from the tree and each other, have a much larger less-sought space to forage in; and the tree enjoying a long period of luxuriant growth before it fall much into seed-bearing, acquires strength of constitution to thrive and increase for ages under this drain.

We are satisfied that cutting or fracture of the root-leaders, especially near the bulb, when they have acquired some size, is injurious to the extension and longevity of the tree, in pines and most kinds of hard wood; and that branch-pruning, as generally practised, is not less pernicious, first, by the {114} derangement which the plant receives, from the regular connexion between the rootlets and their affiliated twigs and leaves being destroyed by the section, and afterwards from the distance between the manufacturing parts, the leaves and the sources of supply in the ground being unnaturally extended, especially when the stem is long, slender, and much denuded.

Although we consider severe root fracture at planting pernicious to some hard wood and resinous trees, yet there are kinds to which it is advantageous. All plants which grow freely by cuttings, strike better to have the roots pruned in near to the bulb. Many kinds of seedling-plants also strike sooner, and throw out stronger new root-leaders, when the long straggling fibres are cut in a little, similar to the branches above, which, when over-numerous and slender, throw out more vigorous shoots by being cropped at planting.