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Tackling Blue-Green Algae in Lough Neagh: The Hemp Connection

lough neagh blue green algae

Lough Neagh, Northern Ireland’s largest lake, has been grappling with a persistent issue: blue-green algae blooms.

These blooms not only pose a threat to aquatic ecosystems but also to the health and recreational activities of local residents. Moreover, considering that approximately 40% of Northern Ireland’s drinking water supply is sourced from Lough Neagh, addressing this problem becomes paramount. While it requires a multifaceted approach, one sustainable solution that has gained attention is the use of hemp.

In this blog post, we will explore how hemp can play a role in mitigating the blue-green algae problem in Lough Neagh, taking inspiration from recent hemp research in the United States.

Understanding the Blue-Green Algae Issue

Blue-green algae, or cyanobacteria, are microscopic organisms that can rapidly multiply in nutrient-rich waters. When conditions are favorable, these algae can form dense blooms, producing toxins harmful to humans and wildlife. In Lough Neagh, excessive nutrients, particularly phosphorus and nitrogen, have been identified as major contributors to these blooms.

The Role of Hemp and Global Inspiration

While addressing the blue-green algae issue in Lough Neagh, it’s encouraging to note that researchers in the United States, specifically in Florida, are also exploring the potential of hemp plants in tackling toxic algae. In Florida, a state with its own history of algae challenges, researchers are testing the use of hemp mats to clear nutrient pollution that feeds toxic blue-green algae and red tide algae. This innovative approach has captured the attention of environmentalists and scientists worldwide.

How Hemp Can Help

Hemp, a versatile plant with various industrial and environmental applications, offers several potential benefits for addressing blue-green algae in Lough Neagh:

  1. Nutrient Uptake: Hemp has the ability to absorb excess nutrients from water, including phosphorus and nitrogen. By planting hemp in strategic locations along the lake’s shoreline or areas prone to nutrient runoff, we can reduce the nutrient load in the water.
  2. Soil Stabilisation: Hemp’s extensive root system helps stabilise the soil, preventing erosion along the shoreline. This is crucial because eroded soil can carry nutrients into the lake, contributing to algae growth. Hemp acts as a natural soil stabiliser, keeping nutrients on land.
  3. Filter Strips: Creating buffer zones with hemp and other vegetation along the lake’s edge can function as natural filter strips. These buffer zones trap sediment and filter nutrients before they enter the lake, reducing the nutrient load that fuels algae blooms.
  4. Phytoremediation: Hemp has been used in phytoremediation projects to absorb contaminants from soil. While not a direct solution for blue-green algae, reducing overall water pollution can indirectly improve water quality and reduce factors that exacerbate algae issues.
  5. Erosion Control: Hemp can be part of erosion control measures, preventing sediment from entering the lake. Sediment often carries nutrients and other pollutants that contribute to algae blooms.

A Holistic Approach

It’s crucial to emphasise that hemp alone cannot solve the blue-green algae problem in Lough Neagh. A holistic approach is needed, which includes:

  • Reducing nutrient pollution from agriculture and wastewater sources.
  • Implementing water quality monitoring programs to track changes and respond promptly.
  • Potentially using algaecides or other treatments to manage existing blooms.

Collaboration and Regulation

To effectively implement hemp-based solutions, collaboration with environmental experts and local authorities is essential. Compliance with local regulations and environmental permits is necessary to ensure that such projects are carried out responsibly.


The blue-green algae issue in Lough Neagh is a complex challenge, but sustainable solutions like hemp can play a role in addressing the root causes. By using hemp to reduce nutrient pollution, stabilise soil, and prevent erosion, we can work towards a healthier and more resilient Lough Neagh, benefitting both the environment and the communities that depend on it. A multi-pronged approach, backed by scientific research and local cooperation, is the key to success in this endeavor.

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