5 Reasons Red Alder Trees Are Crucial To The Pacific Northwest

Oregon State University / CC BY-SA 2.0

Written by Micky Moran

Published: December 15, 2023

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Red alder trees are the only members of the birch family that grow large enough to sell as commercial lumber. As one of the most important hardwood trees in the Pacific Northwest, they grow up to 130 feet tall with up to a 34-inch-wide trunk. Even though they don’t reach their full maturity until they are at least 60 years old, they usually only last to be 100 years old.

Most of these trees grow along the Pacific coastline of North America, ranging from Alaska to southern California. Because of their need for moist soil, they won’t grow much further than 125 miles away from the coast, which is why they grow so well at low elevations. In the last 100 years, the popularity and availability of red alder hardwood have skyrocketed, making it possible for more people to use it in home projects. This widespread use of red alder hardwood is just one of the many reasons it is a necessary resource for the Pacific Northwest.

This Tree Provides Food For Other Animals To Eat

When food is scarce, animals seek out the abundant red alder trees for survival.

Every plant in every forest is part of a substantial ecosystem, releasing seeds from one plant for an animal to pick up the remains. Birds and small mammals look for these seeds on the floor of the forest because they fall during the winter months when finding food gets harder. Redpolls, goldfinches, and mice all consume these seeds, but they fall in such abundance that there’s no risk to the population. These seeds support their digestive tract, keeping them full until their next meal.

The Bark Is Used To Make Medicine

The bark of the tree can be used to create an extract that helps with many health conditions.

The red alder tree’s bark is one of the most important pieces to harvest. Scientists capture the natural nutrients from the bark as one of the main ingredients in different infusions. According to current research, the use of these extracts makes natural treatments for issues like congestion, colds, and even anemia. In the right balance, the bark works to soothe pain or provide a laxative effect. At one point, it was a crucial ingredient to relieve sores or other irritations in the skin.

The Lumber Of Red Adler Trees Is Softer Than Others

Carpenters most frequently use red alder hardwood for flooring or furniture.

If you decide to work with red alder lumber for your main hardwood, you’re in luck. As one of the softest hardwood options presently available, it bends without breaking easily. It has 9,800 PSI bending strength, which is why many people choose it for their cabinetry or decorative furniture.

As you use this hardwood, the low cost is one of the biggest advantages. The rise in the popularity of this hardwood is part of the reason that the cost has come down so dramatically through the years. While the hardwood won’t last forever, the right construction gives it 40-60 years before needing replacement.

They Prevent Erosion In The Landscape

Creating a barrier with red alder trees protects your land from the damage of erosion.

While there are many obvious advantages to using red alder wood after harvesting, it also serves a purpose when it is still in the ground. Many cities in the Pacific Northwest use it as a natural and safe method to prevent erosion. Steep slopes come with a high risk of erosion during inclement weather, but planting a few of these trees gives you protection. Though the payoff isn’t immediate, the falling leaves eventually create a layer of litter that obstructs erosion. The litter layer takes 3-5 years to form after planting, but the long-term protection from damage gives this tree even more value.

Red Alder Trees Improve Soil

The soil around these trees soaks in the nitrogen that they release, improving the fertility of the soil.

The ecological importance of red alder trees is just as important as the way that they support natural medicine and the lumber industry. It doesn’t take long for the trees to invade bare soil because it only requires a shallow area to take root initially. As it grows, the roots balance out the nitrogen levels with a bacteria that thrives in disturbed soil. This bacteria – known as an actinomycete – can even balance out the bacteria and other compounds in soil that other plants use as well.

Reasons That The Pacific Northwest Needs Red Adler Trees: A Summary

1As the seeds of the red alder tree fall, they feed animals in the scarcity of winter.
2The extract from the tree’s bark acts as a medicine for many health conditions, even when applied topically.
3The softness of red alder hardwood bends without breaking, creating stability in newly constructed furniture and flooring.
4Their layer of litter naturally obstructs erosion.
5Red alder trees release a strain of bacteria that makes soil healthier.


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About the Author

Micky Moran

Micky Moran is a writer at A-Z Animals primarily covering mammals, travel, marine life, and geography. He has been writing and researching animals and nature for over 5 years. A resident of Arizona, he enjoys spending time with family, going on adventures across the United States with his wife and kids by his side.

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