Seagrass Restoration Pilot Launched

The first pilot seagrass meadows are being planted on Germany's Baltic coast this summer. According to the Rewilding Oder Delta team, this action marks a shift from planning to active marine restoration after several years of preparation.

From Surveys to Seabed Planting

The journey toward restoration began in 2023. Underwater surveys that year identified remaining fragments of common eelgrass, or Zostera marina, around the island of Ruden. The team then assessed the area's rewilding potential. Since then, the group has worked with scientists and specialists to develop the necessary knowledge and techniques.

This summer's small-scale trial is a major milestone. It is designed to test whether seagrass can establish successfully under local conditions. The team will monitor the plots closely in the coming months.

"Restoring nature at sea requires patience, curiosity, and a willingness to learn," says Ringo Behn, the team's Coastal Ecosystems Coordinator. He stated the pilot is about understanding how these ecosystems respond in real-world conditions.

The Vital Role of Seagrass Meadows

Seagrass meadows are among the Baltic Sea's most valuable ecosystems. They are dominated by common eelgrass, a flowering plant. These underwater meadows provide crucial nursery grounds for fish like Atlantic herring. They shelter countless marine species, stabilize seabed sediments, and improve water quality. They also reduce coastal erosion and capture significant amounts of carbon.

Much of this habitat has disappeared in recent decades. Nutrient pollution, climate change, fishing, and physical disturbance are the causes. Restoring them could strengthen coastal resilience, support fisheries, and contribute to climate mitigation.

As part of the broader Blue Stepping Stones initiative, researchers will develop habitat suitability models. These models will identify where restoration is most likely to succeed. The team also plans to explore sustainable ways of sourcing native seagrass plants, prioritizing material from aquaculture or naturally washed-up plants.

Testing an Innovative Restoration Technique

A key feature is the use of an innovative technique developed by the German company ZosteraTec. The method does not involve planting individual shoots by hand. Instead, young plants are first established on biodegradable, plastic-free textile ropes made from old seagrass. These ropes are then gently rolled out across the seabed, similar to laying turf.

This technique has shown promise in more sheltered Baltic waters. The pilot plantings around Ruden will test its performance in more exposed conditions. Stronger wave action there presents an additional challenge. Factors like wave exposure, sediment movement, and water quality will all influence the seagrass's development.

The Blue Stepping Stones initiative is funded by the German Federal Environmental Foundation. Its long-term ambition is to restore a connected network of marine and coastal ecosystems. This network would support richer biodiversity, healthier fisheries, and greater climate resilience. Seagrass restoration is just the first step. Future phases could expand to other habitats.

Complementing the practical work, a planned marine education hub in Peenemünde will help visitors and local communities discover the Baltic Sea's hidden richness. The hub will use exhibitions and workshops to build support for marine rewilding. These combined efforts aim to build a foundation for healthier seas across the Baltic region.