Why Urban Greening Is Rewriting the Script for Cities

By Linda Serck, Content Marketing Manager

For too long, 'nature' and 'conservation' have been deemed the domain of the rural landscape - rolling hills, ancient woodlands, and wildflower meadows. Yet the most radical frontier for biodiversity isn’t an upland valley or coastal heathland - it is the city.

As urban areas expand, it has become both an ecological imperative and a social necessity to bring nature back into our cities. Urban greening - the strategic weaving of vegetation and an ecosystem mindset into the built environment - plays a key part in the fundamental shift in how we design and live in cities.

In the coming decades, this shift will underpin how urban planners, conservationists, and community ecologists define their professions.

Cities as non-concrete jungles

Urban greening refers to the intentional integration of plants, soils, and water systems into urban fabrics - from street trees and wildflower verges to green roofs and wetland parks.

Well-designed urban green infrastructure delivers measurable environmental, social and economic benefits. Vegetation helps cut carbon, filters air pollution, regulates microclimates and improves water management by reducing stormwater surges.

It also offers spaces that support physical activity, reduce stress, and foster social cohesion. Studies link exposure to urban nature with improved wellbeing and reduced incidence of mental health problems in children. Urban ecosystems can even provide habitats for species that struggle in intensively farmed or fragmented rural landscapes.

Cities do not have to be biodiversity deserts. Research shows that urban green infrastructure can support high levels of biodiversity and supply vital ecosystem services. In many metropolises, well-managed green spaces - when designed with ecological complexity in mind - can rival nearby natural environments in the ecosystem services they provide.

Planning nature into the urban matrix

A key question is how cities can be made greener successfully and at scale.

Professor Samer Bagaeen - Head of Urban Planning at the University of the Built Environment, Vice President of the Royal Town Planning Institute (RTPI), and a renowned expert in sustainable urban strategy - has long championed the idea that cities must be reimagined as ecological systems.

He said: "Nature-positive development is not a barrier to growth - it is the foundation of a resilient, productive and prosperous future.”

This mindset shift has implications for professional practice. For planners, conservation professionals and landscape managers it means developing skills that combine ecological literacy with spatial design, policy negotiation and community engagement. It calls for holistic frameworks that value biodiversity outcomes alongside housing, transport and economic development goals.

He also highlighted the ‘Nature Is Growth’ campaign, which brings together most of the UK’s built environment professional bodies, and aims to position built environment professionals as authoritative, solutions-focused advocates for nature-positive housing and infrastructure.

He said: “It highlights that environmental enhancement is not in conflict with economic growth but is fundamental to economic resilience, productivity, place quality and public wellbeing, while also meeting housing requirements.

“By presenting a unified professional voice to government, the campaign underscores the sector’s significant economic contribution and firmly pushes back against any weakening of nature-positive mechanisms, emphasising their importance to long-term prosperity.”

Green roofs - habitats on high

One of the most visible and potent examples of urban greening in action is the proliferation of green roofs.

Once considered a niche architectural flourish, green roofs are now recognised as potential biodiversity hotspots - especially when designed with ecological objectives, not just climate mitigation or visual appeal.

The University of the Built Environment’s Academic Excellence Award 2025 winner, William Norton, focused his dissertation on the current state of London’s green roofs and their ability to support endangered and threatened plant and insect species. A key part of his research examined how the distance between green roofs affects their ecological value.

He said: "I looked at the distances between green roofs in London at the moment and concluded that if we can improve the connectedness of green roofs, there is potential for species to travel between buildings.

"They already provide insulation on the roofs of buildings, which can enhance the operational sustainability of a building itself by reducing energy needs marginally.

"And if you put a strong community of plant species on a roof, that can help not only those plants - especially if they’re endangered - but also insect species and pollinators that are threatened or critically endangered."

Elsewhere, case studies from cities such as Basel in Switzerland show that when green roofing is mandated for new and renovated buildings and curated with native plants, it can support air quality improvements, stormwater retention and heat mitigation while sustaining wildlife.

For conservation professionals, green roofs can be conceived as habitats, with appropriate substrate depths, plant communities and design features that allow insects, birds and pollinators to thrive. This perspective echoes recent academic research showing that cities can host significant biodiversity when habitat patches are thoughtfully connected and scaled across urban areas.

Implementing urban greening - five practical recommendations

1. Embed greening early in planning processes

Nature must be integrated from project inception, not appended as an afterthought. This means involving ecologists and landscape experts at the earliest design and policy stages.

2. Prioritise ecological connectivity

Design green infrastructure as a network. Map existing vegetation, identify gaps and plan routes that link isolated green spaces to create functional habitat corridors.

3. Select plant communities for ecological value

Choose native and diverse plant species that offer food, shelter and breeding opportunities for local wildlife. Simple lawns are insufficient; layered plantings deliver richer habitat.

4. Build monitoring and learning into projects

Set measurable ecological and social outcomes. Regularly assess vegetation survival, species presence and community use to guide adaptive management.

5. Champion multipurpose green infrastructure

Make the case for multifunctionality - emphasising climate resilience, flood mitigation, wellbeing and biodiversity in proposals to decision makers and funders.

Cities as conservation landscapes

For professionals in the conservation and built environment sectors, this reality offers new career horizons and responsibilities. Whether shaping policy, designing green corridors or managing ecological outcomes, the work ahead is about connecting nature with urban life in deliberate, scalable and socially just ways.

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