Specific character of A. glutinosa. Common Alder. Leaves roundish, cuneate, waved, serrate, glutinous, downy at the branching of the veins beneath. A moderately-sized tree, with rugged bark, and crooked, spreading, smooth branches: barren catkins long, pendulous; fertile ones short, oval. Flowers in March.
The Alder grows naturally in Europe from Lapland to Gibraltar, in Asia from the White Sea to Mount Caucasus, and in the north of Africa, as well as being indigenous in England. The flowers bloom in March and April; they have no gay tints or beauty to recommend them, and consequently afford pleasure only to the botanist or the curious observer of nature. The leaves begin to open about the 7th of April, and when fully expanded are of a deep dull green. The bark being smooth and of a purplish hue, the tree has an agreeable effect among others in all kinds of plantations of the watery tribe.
The Alder must have grown to a great size in days of yore; for Virgil speaks of vessels made of this material:
When hollow Alders first the waters tried.
And again:
And down the rapid Po light Alders glide.
Ovid also tells us that
Trees rudely hollowed did the waves sustain,
Ere ships in triumph ploughed the watery main.
Abroad this tree is raised from seed, which is decidedly the best mode, and secures the finest specimens; though in this country they are generally propagated by layers or truncheons. The best time for planting the latter, is in February or March; the truncheons being sharpened at the end, the ground should be loosened by thrusting an iron crow into it, to prevent the bark from being torn off; and they should be planted at the least two feet deep. When cultivated by layers, the planting should take place in October, and they will then be ready to transplant in twelve months' time.
The Alder is usually planted as coppice-wood, to be cut down every five or six years, for conversion into charcoal, which is preferred in making gunpowder. The bark on the young wood is powerfully astringent, and is employed by tanners; and the young shoots are used for dyeing red, brown, and yellow; and in combination with copperas, to dye black. It is greatly cultivated in Flanders and Holland for piles, for which purpose it is invaluable, as when constantly under water, or in moist and boggy situations, it becomes hardened, black as ebony, and will last for ages. On this account it is also very serviceable in strengthening the embankments of rivers or canals; and while the roots and trunks are preventing the encroachment of the stream, they throw out branches which may be cut for poles every fifth or sixth year, especially if pruned of superfluous shoots in the spring.