National Tree Week, Ireland’s largest annual tree celebration, takes place from the 8th-15th March. Communities nationwide are invited to come together to appreciate the beauty and critical importance of Ireland’s trees for National Tree Week.
Growing a Greener Future Together, the theme of National Tree Week 2026, highlights the importance of collaboration and community involvement in creating a more sustainable and healthier Ireland.
Thousands of planting projects throughout National Tree Week are made possible by this cooperation, which makes trees available to communities, schools, local authorities, and volunteer organisations nationwide.
The Importance of Trees for Water Quality
Trees are often overlooked champions of clean water, functioning as natural filtration systems that help protect and preserve our vital aquatic resources. Some of the benefits include:
Tree shade
The presence of trees provides rivers, lakes and streams with shade, keeping the water and its inhabitants cool. Without shade, water temperatures can rise quickly, especially in shallow streams. When trees grow along the bank of a river or stream, their canopy can block direct sunlight from hitting the water, helping prevent harmful algal blooms.
Buffer zone
A barrier of trees either surrounding farmland or along the banks of rivers can mitigate the effects of pollution entering the waterbody. The trees and vegetation forming this barrier, often referred to as a “buffer zone”, can absorb the nutrients before they reach the water.
Healthy buffer zones are closely linked to healthy aquatic ecosystems. If there is a barrier of trees, fallen leaves can provide food for aquatic organisms.
Also, large woody debris creates diverse in-stream habitats, which boosts biodiversity in the water and maintains a resilient environment.
Riverbank stabilisation
Tree roots grow deep into the soil, binding it together and holding it in place during high rainfall events. They provide a natural reinforcement that reduces erosion and prevents banks from collapsing into the river.
When riverbanks are stable, less sediment washes into the water. That means clearer streams, a healthier fish habitat, and fewer pollutants entering the waterbody. Their intricate root systems act like filters, removing pollutants and slowing down the flow of water entering our water system.
For more information
National Tree Week is organised by the Tree Council of Ireland in conjunction with Coillte.
Find out more about National Tree Week.
