“Jardin de la Rue” the Phenomenon of Urban Green Infrastructure: A Case Study of Street Vegetation in Bordeaux

Current approaches to urban greenery often led to a certain uniformity of vegetation. The desire of residents to be able to grow plants according to their own preferences and to co-create the appearance of the surroundings of their houses therefore leads to the emergence of spontaneous initiatives. One of these phenomena is the narrow strips at the interface between the foundations of houses and the sidewalks of streets in continuous urban development, which are used for growing plants and are referred to as “Jardin de la Rue”. The assessment of street vegetation with “Jardin de la Rue” elements took place in the urban district of Saint-Genès, which is part of the city of Bordeaux in the Nouvelle-Aquitaine region in France. The description of the street vegetation with the “Jardin de la Rue” represents an important first step towards understanding the causes of their creation and the subsequent ecological and social interactions. The creation of these small green spaces is the result of the initiative of residents, and these areas are not part of the planned urban green space. Field surveys in selected streets took place in August–September in 2023, 2024 and 2025. Based on the analysis of the species composition, a total of 107 plant taxa were recorded in the streets. The most frequently recorded ornamental taxa include Lonicera japonica Thunb., Alcea rosea L. and Passiflora caerulea L. The most popular group of cultivated plants consists mainly of lianas, e.g., Akebia quinata (Thunb. ex Houtt.) Decne., Ipomoea purpurea (L.) Roth, Lonicera japonica Thunb., Parthenocissus tricuspidata (Siebold & Zucc.) Planch., Passiflora amethystina J.C.Mikan, Solanum laxum Spreng., Trachelospermum asiaticum (Siebold & Zucc.) Nakai, Trachelospermum jasminoides (Lindl.) Lem. and Wisteria sinensis (Sims) Sweet. The most frequently represented taxa belong mainly to the weed group, e.g., Amaranthus deflexus L., Taraxacum sect. Taraxacum F.H.Wigg., Paspalum dilatatum Poir. The vegetation of the “Jardin de la Rue” elements is a manifestation of the cultural function of plants. The free choice of cultivated taxa allows residents to express their preferences and relationship to the place. Respect for these spontaneous green spaces and their vegetation composition by the city administration is a manifestation of mutual cooperation and at the same time a means of strengthening the ties of residents to their place of residence. These elements may deserve greater consideration within contemporary approaches to construction, architecture and urban planning.