Working with nature

From increasing biodiversity to managing water, sustainability and caring for the landscape are key to what we do at RHS Garden Bridgewater

Our fifth garden, RHS Garden Bridgewater in Salford, opened its gates in May 2021. The last few years have seen a diverse mix of architects, designers, engineers, horticulturists and volunteers working hard to bring the garden to life. However, this is in stark contrast to the diversity of the environment they have been working in.

Between 2016 and 2017, before work got under way, surveys revealed that the garden’s main ecosystems were in a poor state of health. Just 282 plant taxa were present, along with 42 bird species and a small number of bats, newts and invertebrates. While the surveys shed light on five protected birds, the report stated: “None of the species recorded belong to the botanical society’s category of ‘rare or scarce’.”

As Bridgewater’s Curator Marcus Chilton-Jones said: “This meant that horticultural planning was relatively straightforward. But it also meant that, ecologically, we started from a very low baseline. We’re right at the bottom of the ladder, but we have an amazing opportunity to create new, species-rich habitats and enhance existing ones.”

Creating new habitats in Salford

Informed by the surveys, a patchwork of natural and semi-natural habitats are now emerging across Bridgewater. Plants within these areas complement natural surroundings and aim to increase biodiversity, with a particular emphasis on the RHS Plants for Pollinators initiative.

Areas of the site, such as the Weston Walled Garden, will be managed as ornamental spaces, but the seeds of ecological diversity are being sown here, too. Incorporating nectar-rich flowers will bring visiting insects and by association the birds and bats that feed on them.

The Paradise Garden in the Weston Walled Garden

A woodland glade in Middle Wood

As well as enhancing existing deciduous woodland and lowland fen – two habitats identified as ‘at-risk’ under the UK Biodiversity Action Plan – the team at Bridgewater is introducing five other significant habitats to encourage wildlife to repopulate the garden, including meadows, ponds and a bog garden.

Some of these spaces will be purist in their approach, while others will balance ecology and aesthetics, incorporating beneficial non-native garden plants alongside native species. This diverse planting will ensure a longer window of flowering through the year and thus more food for wildlife.

“This project has been led by the landscape. We’re not trying to impose artificial habitats or work against nature.”

Marcus Chilton-Jones, Curator

A home for pollinators

One of the more traditional habitats can be found in the Orchard Garden, where a hay and wildflower meadow will surround a ‘mother orchard’ of heritage fruit trees. Such a combination supports invertebrates and birds, and especially pollinating insects.

Also within the Orchard Garden, a sensitively designed Bee and Butterfly Garden is being established. Flowering plants have been carefully selected to provide a year-round source of nectar for pollinators, from snowdrops in early spring through to autumn bulbs and winter-flowering shrubs.

Pollen and nectar rich plants in the Bee and Butterfly Garden

Layers of edible crops, shrubs and trees in the forest garden

Permaculture principles

In the Kitchen Garden lies the forest garden, where the team is using permaculture principles to layer edible crops with shrubs and trees to enhance productivity, as well as biodiversity. This layering naturally creates cover and offers protection for wildlife.

The beds are regularly mulched with compost and bark. While this creates invertebrate and fungi habitats, it also improves the soil’s structure, increasing its water-holding capacity and lowering reliance on the site’s water supply.

“Bearing in mind that last year the Kitchen Garden had no soil in it at all, there’s been an abundance of wildlife that’s already appeared. It’s quite amazing.”

Sylvia Travers, Team Leader

Water management

In keeping with Bridgewater’s sustainable ethos, the team is keen to work with the water on site rather than against it, implementing a Sustainable Urban Drainage system.

The site-wide strategy captures surface water, diverting it through the wet woodland of Middle Wood and a series of swales and ditches, to collect in Ellesmere Lake. The site’s car parks have permeable surfaces to collect water run-off, which is channelled to a detention pool that can hold up to 24 hours of constant rainfall.

Pools and ponds collect rainwater in Middle Wood

Sustainability is key to the Welcome Building and water management

Sustainability is key

These drainage systems slow the flow of water across Bridgewater, reducing soil erosion and flood risks, and benefitting the ecology of the garden. The stored water will be used to irrigate the Garden Centre, as well as the garden during drier summer periods.

Leading the way in Bridgewater’s sustainability effort is the Welcome Building. Ecology and efficiency combine in many of the building’s features helping to reduce its carbon footprint.

A green Welcome Building

Working with United Utilities

We are proud to work in partnership with United Utilities, who are responsible for water and wastewater services for the North West of England. We are working together across several areas of the garden to achieve our sustainable ambitions and keep our daily operations as green as possible.

United Utilities have been key in supporting our behind the scene operations, providing advice for all areas of water management across site, from our Sustainable Urban Drainage systems through to harvesting rainwater to reuse in our Welcome Building.

We hope that this partnership will encourage our visitors to think more about water management and how little changes can have a huge impact on our environment.

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