A Pioneering "Green Gravel" Project Will Replant Britain's Lost Kelp Forests
A new marine licence has cleared the way for one of the UK's most ambitious kelp restoration projects, using lab-grown juvenile kelp seeded onto small stones to rebuild underwater forests at scale — a quiet revolution happening beneath the waves.
Globally, kelp forests are disappearing faster than coral reefs and tropical rainforests. The UK has lost vast areas of its native kelp to climate change, pollution, coastal development, and damaging fishing practices — a quiet collapse most people will never see, hidden beneath the waves.
Now, a pioneering project led by the Marine Biological Association and Newcastle University has secured the marine licence it needs to begin large-scale restoration using a deceptively simple new technique: green gravel. Juvenile native kelp is grown in laboratories, attached to small stones, and then placed onto the seabed where it can take root and grow into mature kelp forest.
The approach matters because traditional underwater planting is slow, expensive, and labour-intensive. Green gravel allows restoration teams to seed wide areas of seabed quickly, with each stone effectively becoming a starter point for a new patch of kelp forest. Scuba divers will mark and monitor the restoration plots over time to track growth, survival rates, and whether the gravel itself stays in place.
The stakes are significant. Healthy kelp forests are one of the most productive ecosystems on the planet. They draw down and lock in carbon, filter pollutants, and provide nursery habitat for commercially important fish — supporting both biodiversity and the long-term future of UK fisheries.
This project sits alongside a growing wave of marine restoration work in the UK, from Sussex's kelp recovery to Scotland's seagrass replanting. None of them will solve the ocean's problems alone. But together, they represent the beginnings of something the UK has rarely had: a serious, science-led plan to bring its underwater forests back.