Green densification model

The first external green wall in Lublin was installed at the University of Natural Sciences in September 2015, and it was later followed by two smaller installations inside and outside in 2017 [5]. Apart from their decorative and aesthetical functions, the walls serve educational and research purposes, as the suitability of the chosen plants for the Polish climate conditions will be evaluated for similar urban projects in the country. Finally, the project promotes urban greenery and certain offsetting for grey infrastructure [1, 2, 3, 5].

In 2008 the new building of the WGV-Insurance has been opened in Stuttgart. Since then customers and employees of the WGV have enjoyed the beautiful courtyards which contribute to a good working environment. The approx. 3.6 ft. (1.1 m) high, built-in planters have been provided with an automatic irrigation system with the irrigation pipes installed below the elevated concrete slabs. The four courtyards have been planted with a total of 58 small crowned trees. In addition, several extensive green roof areas of approx. 21,600 sq. ft. (2,000 m²) total were installed to improve the Stuttgart climate. (1, 6).

The 40-storey mixed-use skyscraper will serve as an economic catalyst for the French city’s central business district and comprise offices, a hotel, a restaurant, and residences. The tree-covered areas of the tower will give the building its iconic appearance and a portion of that green space will be open to public use (Ref. 1). Trees will line the platform of the building and a ribbon of gardens will curl around the glass facade to its full height (Ref. 2).

The Park Killesberg serves as the green centre of the newly constructed district in Stuttgart and continues the long history of the area as a garden show site with a contemporary expression of landscape architecture and as a model for interconnected green spaces. The design is the result of a collaborative process with the local authorities, citizens and neighbours (1).

Greened-over urban railway tracks (grass tracks) is a city-wide program in Stuttgart which assumes the construction of tram lines with grassed-over tracks. This applies not only to planning and construction but also long-term maintenance (ref 1).

A large urban park in Lublin was built to commemorate John Paul II’s visit to Poland in 1987. The project ensured the utmost possible preservation of the natural terrain so that it forms a harmonious whole with the surrounding landscape. The park serves as a green recreational area for the citizens with its open-air sports facilities and a small amphitheatre for local festivities and extracurricular activities [1].

The garden was designed by landscapers Michèle Orliac and Miquel Battle and realized for a cost of 3 million euros. This "new green lung", as presented by the City Hall of Toulouse, is part of a major urban project that provides for the creation of 500 housing units in the Niel District (Ref. 1). The project involved creating vegetation enmeshed benches (Ref. 7) and using permeable flooring materials that prevent water loss and reduce the potential of flooding (Ref. 8).

Derelict flats are replaced by an oasis (including flowers and fine art) on the Aysgarth estate, creating a "long-waited community haven". A community garden was officially opened to "create an area of much-needed green space". (Ref. 1) The project aimed to create a garden that the whole community could enjoy. (Ref. 1)

The project introduces an urban park in the place of a formerly derelict area and a landfill, located by the river valley of Bystrzyca. The park would increase access to the green recreational area in the city, which is a part of a longer-term plan to make the river’s banks citizen-friendly and easily accessible. The initiative includes: clearing the land and planting greenery, construction of the 'sensory' garden for the youngest users, building walking and cycling paths and infrastructure adjusted to people with disabilities, as well as installation of the nesting boxes, feeders and insect hotels [1].

"Anglers Country Park (and a local nature reserve) is dominated by a lake, surrounded by grassland, woodland and a wetland area." "This originally farmed landscape was dramatically changed when it became one of the deepest opencast mines in Europe, reaching a depth of 250 feet." Restoration work began after the mine closed, creating the country park. (Ref. 1, 2)