Point location, which indicates where the NBS takes place

The Oriental Park of the City of Porto is an urban natural park designed by the landscape architect Sidónio Pardal. It will be one of the largest urban parks in the country and the second-largest in the city of Porto. This NBS focused on the transformation of a derelict, depressed urban area into a green space. The first part of the park was inaugurated in July 2010 and the municipality has plans to build it through several phases over the next decade until it reaches its project area. (1)

The Haumanngarten is a community garden in Essen founded by the Transition Town movement (Ref. 1). Since May 2015 a mixed group have been growing vegetables, herbs, flowers and berries on a former playground. Fellow gardeners with and without knowledge of gardening participate in the garden (Ref. 2).

The park, dedicated to the Sicilian judge assassinated by the mafia in the early 90s, was the object of a regeneration project by two associations (with the approval of the municipality). The initiative was practically implemented by kids of several schools in Catania, which were invited to the park with the intention of cleaning the area to make the spot available to new plants and trees. This is not just a natural intervention, it is of great cultural and social value for the importance of the character for the city and region. (Ref.1.)

Green space created behind Rock Ferry library on unused land. The plot of unused land, owned by the Wirral Council, signed a lease with the 'Grow Sow Well' project to run a volunteering scheme and sessions for the community (particularly aiming to help people with mental health issues). Grow Sow Well worked with residents, schools and community groups, bringing people together to celebrate their area and increase awareness of healthy eating and food production. (Ref. 1, 2) This lease has was transferred to the organisation called the Utopia Project (works with young people and includes horticulture). (Ref. 8)

A class of thirty students of a preschool "Jeanne Hachette of Rouen built, in the playground, an overgrown plant wall where climb non-toxic plants blooming from June to August (Ref. 1). Students engaged in a six-week educational module prior to planting the wall (Ref. 1). Engineering students from engineering school ESIGELEC assisted in delivering the program which taught students about the importance of plants and respecting the environment (Ref. 1).

This citizen-based initiative takes place in the heart of the city, in between the streets Montesano, San Michele, Carcaci, Sangiuliano. The project is the result of a collaboration among residents, artists and shop owners who are planning the regeneration of the area, which is currently in a state of decay. In particular, they realize green interventions (biological horticulture gardens, 100 new plantations) in the streets and on the buildings, to make the area more liveable and attractive for tourism. The initiative is fully supported by the municipality, who implemented the public areas to implement the interventions. (Ref.1.) This NBS has been an annual event, happening since 2013 (Ref. 2).

This local initiative has revitalized the most neglected places in the district and transformed them into green areas for leisure and recreation. The project resulted in the planting of new greenery (grasses, bushes, and flowers) and better maintenance of the existing plants, as well as installation of leisure and sports equipment (including benches and open-air gym) [1,2].

The project aims at realizing a large urban park to link the city and the sea coast. It is a project of significant social value, as it takes place in a neighbourhood which has been in a state of decay for 50 years. The intervention includes new facilities for recreation and sport, but first of all new plantations and the creation of rooftop gardens. It would be the second-largest park of the city, by linking the city and the sea. (Ref.1.)

The first external green wall in the public space in Poland was installed on the surface of a 30 square meters wall of the Infobox building in Gdynia [1,2]. The project serves aesthetic purposes and aims to improve air quality. The wall was composed of the plants suitable for the Polish climate conditions [3].

Tondiraba is a green urban area located in Lasnamäe, it is a valuable area with a diverse landscape which at the start of the initiative was severely overgrown and randomly used. The city planned to build an eco-golf course where the diverse and species-rich landscape and protected species are preserved. The architecture of the golf course is based on the advantages of the natural location and an ‘eco-golf course' concept. These landscapes and their flora were generated with landscape maintenance methods, which results in ‘micro-communities’ in which the ecosystems characteristic of the given area would start developing (ref 1, 5).