Earmarked public budget

Allotment gardens have a long tradition in Hannover, with approximately 20.000 gardens stretching around the city as a green belt. In the last decades, some gardens were threatened by disappearance due to investment interests (Reference 1). With the goal to protect these gardens, the city employed a so-called "Kleingartenkonzept" (allotment concept) in 2016 with the help of the association of allotment gardens (Bezirksverband Hannover der Kleingärtner e.V.). The concept aims to keep the number of existing gardens for social and ecological considerations while allowing for new residential investments which is vital for the growing city. (Reference 2).
As part of the concept, extensive inventory examinations were conducted on areas affected by conversion and restructuring, along with the start of implementation of smaller development projects for housing and the creation of replacement gardens in some areas. Because the need for residential spaces has been covered for until the end of 2019, the conversion of allotments for the said land use has been stopped; it will be revisited in 2024. (Reference 2)
To address the problem of future allotment garden losses, gradual elimination of permanent vacancies has started by creating new smaller and more attractive gardens from oversized ones, by improving accessibility and optimizing spaces, and by modernizing allotments (Reference 2).

The Werd Administration Centre contains a green park that provides a good variety of trees with an aesthetic view of the city. Ornamental cherry trees create a lively atmosphere, in the spring with their double-blossom flowers, and in the autumn as their canopy changes colour. This park has been renovated a few years back to increase habitat diversity. The building itself got another renovation in 2014. (Ref 1)

It is one of the most famous parks in the city. A re-design is offering the opportunity to make use of the full potential of the place and to put it back into the public’s focus – as a place for recreation, a park, a promenade and Zurich’s very own, most central urban park. An urban square was formed, representing generosity and offering space for multiple functions. A gateway from park to courtyard during the daytime, the mirroring water surfaces of the illuminated pools, and the annex’s reflecting façade create the atmosphere of a grotto at night (Ref 1).

An ongoing extensive expansion of park Lauta in Plovdiv has been carried out. The primary nature-based means used in the project is tree planting. However, animals were also introduced to the habitat. The project aims at creating a suitable place for recreation, purifying the air of Plovdiv, and enriching the park's fauna (Ref. 2; Ref. 3; Ref. 7).

Renovations were conducted on Bayard Street, an artery in Toulouse, between 2016 and 2017 Rue Bayard, in anticipation of the arrival in 2024 of a new metro station and the complete overhaul of the Matabiau district (Ref. 10). Renovations included introducing vegetation to the commercial street leading to Matabiau station (Ref. 5) and its newly renovated city centre via planting 81 trees (44 pear trees and 37 hazel trees of Byzantium) (Ref. 2). Furniture was also added and sidewalks were widened for greater pedestrian comfort (Ref. 2).

Iasi is a city with a relatively high number of parks and this NBS is part of an initiative of the municipality of Iasi to restore green area affected by the passage of time. The green space in the Orăşel Park was inhomogeneous as vegetation with unpopulated areas of trees (the centre of the park) in contrast to agglomerated vegetation areas.
The growth of woody vegetation had in some respects changed the appearance of the landscape ensemble, creating agglomerations of shrubs and trees. As such the municipality took the decision to rehabilitate the area (1)

The former site of the Krupp cast steel factory was transformed into a 230 hectares green belt stretching from the city
center to the district of Altendorf, while the adjacent industrial wasteland was turned into an 11 hectares add-on to the Krupp Park (Ref. 1). The landscape vision "Freiraum creates urban space", in which the Krupp Park is a building block, is a comprehensive strategic approach that aims to gradually build up new urban landscape structures and to create diverse qualities of location for different urban uses" (Ref. 9).

The city of Leipzig initiated the project "Für eine Baumstarke Stadt" in 1996 to integrate community support into the greening of Leipzig through tree planting. Citizens can become tree sponsors with a donation of 250 Euros or more supporting the increase of the tree stock in parks, on the street and at squares since they are planted in addition to the tree stock determined by the city department for urban green. The sponsorship includes a sign with the indication of the tree species and a personal message. This programme contributes to a greener city landscape and strengthens the attachment of citizens to their urban environment (1, 2, 3).

The initiative created the first in the city anti-smog garden around a local school. The garden serves multiple purposes as it will include: a greenhouse and a composter, the air-pollution absorbing plants that will attract birds and insects and protect the school from urban dust and noise, a vegetable garden, houses for hedgehogs, birds and butterflies, a 'sensory' path for medicinal gymnastics, a roofed gazebo, a meteorological station and a book exchange booth. It is open to other schools and kindergartens and the general public during the school working hours - for educational purposes and recreation [1,2].

This NBS comes as a reply against the municipality of Iasi which in 2013 cited lack of visibility and aesthetic preoccupation decided to cut over 100 linden trees and replace them with Japanese acacia in the city centre. The action enraged the inhabitants of the city who alongside local and national NGOs took the matter into their own hands and protested. As such in 2015 the municipality re-planted the linden trees (1).