Conservationists and volunteers are actively working to restore Britain's severely depleted seagrass meadows, with efforts currently focused on Penrhyn beach on Ynys Môn (Anglesey) in north Wales. Project Seagrass, a leading charity, is spearheading initiatives to re-establish these vital underwater ecosystems, which have seen a decline of up to 92% across the UK over the past century.

Seagrass meadows play a crucial role as nurseries for a diverse range of marine life, including fish like cod, crabs, cat sharks, cuttlefish, and even seahorses. Beyond supporting biodiversity, they offer significant environmental benefits, acting as natural carbon sinks, purifying water, and protecting coastlines from erosion. Dr. Oliver Thomas, a senior science officer at Project Seagrass, noted the ongoing challenge, observing that recent harsh winter conditions had impacted some newly planted areas despite hopeful signs of resilience.

The restoration process involves planting millions of seeds, painstakingly collected by hand from existing healthy meadows. Volunteers, including 12-year-old Annabelle Campbell-Priest, use specialized tools like caulking guns to precisely embed seeds into marked plots. A hand-pushed seeding machine is also employed for faster, though less precise, distribution. Rhun ap Iorwerth, a local Senedd member and leader of Plaid Cymru, highlighted the importance of engaging young people, fostering a sense of responsibility for these future marine environments.

The widespread loss of seagrass has been attributed to multiple factors, including the development of new ports and harbours, land reclamation, pollution influxes, disease outbreaks, and physical damage from boat anchor chains. Climate-related events have also taken a toll, such as a heatwave in 2025 that decimated a meadow on the Llŷn peninsula and storms in 2023 that wiped out new growth in the Firth of Forth. Young meadows are particularly vulnerable to environmental stresses and even grazing by brent geese.

Dr. Richard Unsworth, Project Seagrass's chief scientist, emphasized the ongoing learning process, noting that systematic seagrass planting is relatively new, spanning only 30-40 years. His team conducts numerous experiments to determine optimal planting methods, seed storage, depth, density, and protection from predators like crabs. Advanced tools, including centimetre-accurate GPS, drones, and environmental loggers, are deployed to understand site-specific factors.

Successful restoration efforts are also underway at various sites across the UK, including the Isle of Wight and Dale in Pembrokeshire, with other groups working from Plymouth Sound to Loch Craignish. Researchers are also investigating the benefits of "seagrass hugs," a technique involving planting a protective ring of adult seagrass around new seedbeds. The Wadden Sea restoration in the Netherlands serves as an inspiration, having achieved significant success after five to six years of concerted planting. Beyond ecological gains, restored seagrass meadows promise economic benefits for local communities through enhanced fishing and tourism.