The short version
- Volunteers have grown and planted more than 1,000 tower mustard plants, marking a successful first year for the restoration project.
- The species, classified as endangered in England, was previously restricted to only two locations in London before this intervention.
- Organizers aim to use this community-based model as a blueprint for conserving other rare native plants facing extinction.
A significant milestone has been reached in the conservation of one of London’s rarest native wildflowers, with volunteers successfully cultivating and planting more than 1,000 tower mustard plants across the capital. This achievement concludes the first year of a major community-led restoration effort designed to reverse the steep decline of Turritis glabra, a species that supports vital pollinators including bees, butterflies, and rare moths. The project represents a shift toward engaging local residents directly in habitat management, moving beyond traditional conservation methods to include hands-on participation from the public.
Before this initiative began, the tower mustard was found in only two locations within London: Lesnes Abbey Woods in Bexley and Stain Hill Reservoir in Richmond-upon-Thames. These sites served as the sole source for seeds used in the restoration program. The plant, which grows to approximately one meter tall and produces delicate white flowers, is associated with open and disturbed habitats. Its population has suffered significantly due to habitat destruction and changes in land management practices over recent decades.
The restoration effort was led by Citizen Zoo and Habitats & Heritage, bringing together a network of land managers, community groups, and conservation partners. At the center of the operation are the Mighty Mustard volunteers, who attended workshops in March to learn how to sow the tiny seeds. Participants were provided with growing equipment, including pots, seed trays, and soil, allowing them to raise the plants at home before they were transplanted into the wild.
The newly grown plants have been reestablished at several sites across London where the species was previously known to occur. These locations include Wimbledon Common, Hounslow Heath, Lesnes Abbey Woods, and Barnes Common. The final planting day took place at Hampton Court Palace’s Home Park, where plants raised by both volunteers and the Historic Royal Palaces Gardens Team were used. This expansion aims to create a more resilient population by distributing the species across multiple habitats rather than relying on just two isolated sites.
Charlotte Harris, nature conservation manager at Habitats & Heritage, emphasized the importance of engaging people in conservation initiatives. She noted that volunteers became deeply attached to the plants they nurtured, suggesting that personal investment can drive successful ecological outcomes. The project is funded by the Greater London Authority’s Green Roots Fund and Thames Water, highlighting a collaborative approach involving public bodies, private organizations, and community groups.
Botanist Dr Mark Spencer provided expert support throughout the project, ensuring that the cultivation and planting processes adhered to best practices for species restoration. The tower mustard is assessed as near threatened on the Great Britain Red List and endangered in England, with only around 30 sites remaining across the country. The success of this London-based effort could offer a template for addressing similar declines in other regions.
This initiative builds on previous successes by Citizen Zoo, such as the Hop of Hope project, where volunteers reared large marsh grasshoppers from eggs at home before releasing them into wetlands in Norfolk. Elliot Newton, director of rewilding at Citizen Zoo, indicated that the organization plans to expand its portfolio of plant conservation projects. He noted that London has lost 185 species of plant in recent history, underscoring the urgency of these efforts.
Looking ahead, organizers hope to apply this community-led model to other rare plants, including copse bindweed, a native British climbing plant. The broader goal is to safeguard biodiversity in the face of climate change and urban development. While individual projects may seem small in scale, proponents argue that they play a crucial role in preserving the ecological integrity of the city. The success of the tower mustard restoration demonstrates the potential for citizen science to contribute meaningfully to conservation goals.
The project involves multiple stakeholders, including Barnes Common, Lesnes Abbey Woods, Wimbledon Common, London Borough of Hounslow, London Borough of Richmond upon Thames, and Historic Royal Palaces. This wide-ranging collaboration ensures that the restored populations are managed by those with direct responsibility for the land. As the plants establish themselves in their new habitats, ongoing monitoring will be essential to assess long-term survival rates and reproductive success.
The restoration of tower mustard highlights a growing trend in urban conservation, where local communities take an active role in protecting native species. By involving residents in the cultivation and planting process, the project not only aids biodiversity but also fosters a deeper connection between people and their natural environment. This approach may prove particularly valuable in densely populated areas like London, where green spaces are limited and under pressure from development.
Sources behind this briefing
Go to the original reporting
- BBC Science & Environment↗Volunteers help save one of London's rarest plants
