Executive Summary

This project involved the systematic eradication of Invasive Non-Native Species (INNS) across a 2.3ha woodland site for Carmarthenshire County Council. Managed by the Woodland Officer, we delivered a multi-phased treatment programme for Japanese Knotweed, Rhododendron, Laurel, and Bamboo, successfully restoring the site for public use ahead of a critical January funding deadline.

About the Client

Carmarthenshire County Council is responsible for the maintenance and ecological health of public green spaces across the county. This project was overseen by the council's Woodland Officer at the site of the former Tregib Secondary School in Ffairfach. The primary goal was to reclaim neglected woodland from invasive species to create a safe, accessible environment for the local community.

The Challenge

The 2.3ha site was heavily compromised by dense infestations of Rhododendron and Cherry Laurel, which had colonised approximately 0.9ha with near-total canopy cover.

Species Matrix: The site required the simultaneous management of Japanese Knotweed, Bamboo, Rhododendron, and Laurel.

Environmental Risk: Work was conducted in close proximity to two active watercourses, necessitating strict chemical control and staff safety protocols.

Public Liability: The area is used informally by the public; the presence of 270m of redundant fencing wire and dense, unsightly vegetation posed significant safety and aesthetic concerns.

Urgency: The project was tied to a fixed financial window, with a mandatory completion deadline of 31st January.

The Solution

We implemented a tailored Integrated Pest Management (IPM) strategy that prioritised root-system destruction and environmental protection:

Japanese Knotweed (August Phase): Large stems were treated via stem injection to ensure herbicide reached the rhizome without environmental drift. Every treated stem was marked with biodegradable marker paint to ensure 100% coverage. Smaller foliage was managed via targeted spray, with all activity logged for the council's records.

Bamboo Eradication: To ensure permanent removal, we performed a full extraction of the roots and rhizomes. By physically removing the underground nutrient network, we eliminated the risk of the bamboo re-establishing itself.

Rhododendron & Laurel Control: Stems over 6cm in diameter were cut low and treated with Eco-plugs. This contained the glyphosate entirely within the stump, preventing any leaching into the sensitive woodland soil or nearby watercourses.

The Implementation

The main clearance phase took place between October and January, requiring high-intensity resource management to meet the deadline.

Safety Protocols: Due to the river proximity, we operated under a specialised Method Statement. Our team wore life jackets at all times when working near the watercourses to ensure full health and safety compliance.

Infrastructure Recovery: We conducted a systematic sweep of the woodland to extract 270m of hazardous wire fencing, which was removed and safely disposed of.

Verification: All work was logged and surveyed to provide the Woodland Officer with a clear audit trail of treated areas.

Additional Projects and Challenges

The Biomass Crisis: The original specification suggested stacking cut material in habitat piles. However, as work progressed, the sheer volume of Rhododendron being cut was far greater than anticipated. Large piles would have been unsightly for a public area and would have hindered the council's plan for replanting.

The Resolution: After consultation with the Woodland Officer, we adapted our methodology. We moved to chipping all material near public access points to provide a clean, managed finish. In deeper woodland areas, we utilised a "lay-flat" processing method, using chainsaws to chop the material more finely so it could be spread across the floor. This suppressed further weed growth and created clear spaces for the council to begin immediate native replanting between the processed biomass.

The Results

2.3ha Restored: The woodland understorey was successfully cleared of all target INNS, significantly improving site visibility and safety.

Targeted Eradication: 100% of Japanese Knotweed and Bamboo rhizomes were treated or extracted, with every stem accounted for in the project log.

Project Handover: All primary works were completed and signed off by the end of January, securing the client's funding allocation.

Environmental Integrity: No chemical incidents or runoff occurred during the project, despite the high-risk proximity to water.

Lessons Learned

The project demonstrated that flexible biomass disposal is essential in public-facing woodlands. While habitat piles have ecological value, the "lay-flat" and chipping methods provide a better balance for public amenity and future replanting accessibility.

Next Steps / Future Plans

We are scheduled to return to the site in late spring to conduct a comprehensive survey. This will involve monitoring for any regrowth from the seed bank and performing a secondary spray on any minor emerging foliage to ensure the long-term success of the eradication programme.Functional Improvement: The transition from paving slabs to Eco-grid significantly improved site drainage and reduced trip hazards, while the new fencing and larch planters enhanced the site’s security and aesthetics.

Minimal Disruption: The facility continued its vital work without interruption, proving our ability to manage complex contracts in sensitive housing environments.

Lessons Learned

The project reinforced the necessity of robust temporary security measures and the value of flexible sequencing when faced with adverse weather. Most importantly, it highlighted that clear escalation routes and close collaboration with site staff are the most effective ways to manage risk in sensitive residential settings.