Celtic Tree Month: Alder

Today is the first of the Celtic Tree Month of Alder, known as Fearn by the Celts. The Alder tree, in the birch family, is deciduous, with simple serrated leaves. The tree also flowers, with long male catkins and shorter female catkins on the same plant. The trees are mostly pollinated by wind, but bees also act as pollinators. The Alder is particularly noted for its role in nitrogen fixation, having large nodules in the roots, wherein live small bacterium that absorb nitrogen from the air and greatly improve soil quality. For anyone who passed 9th grade biology, the Alder is a pioneer species, meaning that it spreads to new areas and prepares previously barren area for the species that follow it. The timber has been used historically for building bridges and foundations, as the wood is very water-resistant.
According to Welsh legend, the Alder tree was sacred to Bran the god-giant. Like the tree sacred to him, Bran made his body into a bridge in order to invade Ireland and help his sister, Branwen. Unfortunately, Bran's head was cut off, and was buried under the modern-day Tower of London. Supposedly, the ravens living in the tower and Bran's sacred birds. Interestingly, it is also said that the Alder fairy can fly in the form of a raven.
In magick, the Alder is well known for having divinatory properties, and therefore this month is characterized by prophecy and getting in touch with one's own intuition. If you are musically inclined, consider carving a flute out of an Alder shoot, and using it to call spirits of Air. Similarly, the tree has connection to the Fey, and charms made of Alder can be used to contact them.
While the Alder is not poisonous, it's also not known for being particularly tasty. The catkins of some species are edible, but due to a highly bitter flavor are generally left for a means of survival only. On the other hand, the bark was common among the Blackfoot Native Americans as an infusion to cure tuberculosis and lymphatic disorders. Now, I personally do not recommend that if you have tuberculosis you go out and make tea with Alder bark; indeed, unless you are an expert forester and know without question that bark from a specific tree is safe to ingest, I would highly advise against it. However, the Alder was also used by the Native Americans as an ingredient for smoking mixtures, so if you happen to have an Alder tree nearby, you might consider using fallen branches in your spring bonfires.