1. General information
Location and description of the intervention
City or FUA
Agege
Region
Africa
Short description of the intervention
This intervention was initiated in 2014 in Agege, a slum and a city in itself belonging to Lagos. Agege is one of the 7th most populated low-income communities in Lagos with a total population of around 1,033,064 people. Climate change in Nigeria led to seasonal droughts and floods, causing pressures in terms of food security as well as high temperature and humidity levels which affect directly the economically disadvantaged population in the slums of Lagos. In 2014 a research team at the University of Cardiff alongside community leaders of a Yoruba community in Agege implemented a study on vertical gardens in residential areas with the purpose of alleviating local temperatures and enhancing biodiversity. The implementation started with a study and was continued with the introduction of practical gardens maintained by the local community of 3 residential buildings (one in Suru Street, another in Lagos Street in Agege, and a third in Abeokuta Street). (1,2,3,4)
Address

Suru Street
Agege 100283
Nigeria

NBS area
4.00m²
Type of area before implementation of the NBS
Timeline of intervention
Start date of the intervention (planning process)
2014
Start date of intervention (implementation process)
2014
End date of the intervention
2018
Present stage of the intervention
Goals of the intervention
The main goals of the intervention were:
1. To bring both thermal comfort and economic benefits to low-income residents of Agege. Inhabitants of these Yoruba communities are living on less than 1 GBP/day;
2. To enhance biodiversity in the residential buildings: the plants used in the vertical walls have a range of uses, from the medicinal properties of aloe vera, to the snake repellent characteristics of the Lantana Camara plant. Most envisioned crops had pollinating properties.
3. To reduce indoor temperatures and fight humidity and the effects of high outdoor temperature.
4. To introduce an innovative responsible approach to vertical gardening that involved locally sourced materials for local people.
5. To increase ownership participation by embracing indigenous ideas as offered by the recruited skillset/ community members in the process of adapting an otherwise expensive prototype within a reasonable financial limit for the target group (Low-income groups).
6. To preserve the building façade from weathering.
7. To reduce urban heat island effects (as vertical gardens add pockets of greenery to overcrowded areas)(1,2,3,4)
Quantitative targets
1. Planting 16 crops/year of different species of vegetables and medicinal plants;
2. Installing 4 prototypes in 2 stages ;
3. Involving over 400 people in implementation, assessment and evaluation;
4. Estimating the costs for the building of the prototypes - (N3,500 or £14 per day) (2)
Monitoring indicators defined
Number of people involved;
Number of crops planted;
Number of prototypes installed;
Daily rates for skilled builders (2)
Climate change adaptation: What were the goals of the NBS?
Climate change adaptation: What activities are implemented to realize the conservation goals and targets?
Habitats and biodiversity conservation: What types of conservation goals are / were defined for the NBS intervention?
Habitats and biodiversity conservation: What activities are implemented to realize the conservation goals and targets?
Please specify "other Type of NBS project"
Sustainable food production
Implementation activities
This intervention adopted a bottom-up approach to low-cost innovation: VGS prototypes were developed in partnership with the local community of Agege (Lagos, Nigeria) and were a 2 stage initiative. Community members contributed to every step of the research process with their context-based expertise, sharing decision-making and ownership. In order to convince the local residents to participate in the intervention, the research team appealed to the community leaders (Baale). A selection of the most "cooperative" streets and residents followed. In the first phase, 2 sites were selected: 1 in Suru street, the other in Lagos street. Community engagement followed for the development of the prototype and had 4 stages of community meetings. A HDPE prototype was installed in Lagos street and a bamboo one was designed in Suru street. Planting started in early May 2014 and plant maturity was reached around 6 weeks later. Phase 2 was implemented in 2016 in Shobowale Street with the help of Guinness Nigeria Inc. Community engagement happened this time in 3 stages. Contrarily to phase 1, prototypes in phase 2 were designed to transfer weight to the walls rather than the ground. Containers were sustained by a wooden frame rather than wooden poles to avoid drilling the ground of the community centre near water boreholes. Planting started at the beginning of September 2016 and plant maturity was reached within 6 weeks. It was reported that the prototypes were still in use in 2018. (2)
It is unclear if the intervention was continued after 2018. Sources after this date were not found online or in any other academic journals making it very hard to reach a conclusion whether the intervention is still functional.
NBS domain and interventions
Ecological domain(s) where the NBS intervention(s) is/are implemented
Nature on buildings (external)
Green walls or facades
Balcony greens
Please specify the number of plots or allotment gardens
4 (2)
Vegetation Type
Amenities offered by the NBS
Services
Expected ecosystem services delivered
Provisioning services
Food for human consumption (crops, vegetables)
Medicinal resources
Regulating services
Local climate regulation (temperature reduction)
Habitat and supporting services
Habitats for species
Cultural services
Aesthetic appreciation
Scale
Spatial scale
Sub-microscale: Street scale (including buildings)
Beneficiaries
Governance
Governance arrangements
Non-government actors
Researchers, university
Citizens or community groups
Please specify the roles of the specific government and non-government actor groups involved in the initiative
The intervention was designed as a study and initiated by a team of researchers at the University of Cardiff. The evaluation of the proposal was done together with the residents who also took lead in implementing the green walls. (2,3)
Key actors - initiating organization
Land owners
Key actors - Other stakeholders involved (besides initiating actors)
Citizens or community group
Researchers/university
Land owners
Please specify other land owner
Private building owned by local residents (2)
Policy drivers
NBS intervention implemented in response to an Regional Directive/Strategy
No
NBS intervention implemented in response to a national regulations/strategy/plan
No
NBS intervention implemented in response to a local regulation/strategy/plan
Unknown
Mandatory or voluntary intervention
Voluntary (spontaneous)
Enablers
Presence of specific city-level GI/NBS vision/strategy/plan - mentioned in connection to the project
Unknown
Presence of specific city-level GI/NBS section/part in a more general plan - mentioned in connection to the project
Unknown
Please specify other vegetation type
Vegetables and medicinal plants - 16 crops/year (2)
Presence of city network or regional partnerships focused on NBS - mentioned in connection to the project
Unknown
Presence of GI / NBS research project - mentioned in connection to the project
Yes
Please specify
The intervention was also featured in a PhD dissertation at the University fo Cardiff - AKINWOLEMIWA, F. 2017. Developing Affordable Vertical Greening Systems and its Impact on indoor comfort for Low Income Groups in Lagos, Nigeria. PhD, Cardiff University (2)
Subsidies/investment for GI / NBS in the city - mentioned in connection to the project
Unknown
Co-finance for NBS
Yes
Co-financing governance arrangements
Unknown
Was this co-governance arrangement already in place, or was it set up specifically for this NBS?
Financing
Total cost
What is/was the Cost/Budget (EUR) of the NBS or green infrastructure elements?
31.1 GBP - 36.18 EUR
What are the total amount of expected annual maintenance costs?
Unknown
What is the expected annual maintenance costs of the NBS or GI elements?
Unknown
Please specify cost savings
Unknown
Please specify total cost (EUR)
In total, the cost was approx. 1616 GBP - 1879 EUR (convergency rate - 30.09.2021: https://www.xe.com/currencyconverter/convert/?Amount=1616&From=GBP&To=EUR ) (5)
Source(s) of funding
Please specify other source of funding
Phase 2 of the intervention was funded by the Engineering and Physical Science Research Council (EPSRC – UK) institutional sponsorship in support of the Global Challenge Research Fund programme. (2).
Type of fund(s) used
Please specify other type of fund used
Grant (2)
Non-financial contribution
Yes
Who provided the non-financial contribution?
Which of the involved actors was motivated by this model?
Please specify technological innovation
The action is considered a technological innovation, especially infrastructural, as the implementing team was experimenting with 3 prototypes: HDPE, bamboo, and timber pre-fabricated. Quality and maintenance costs were also discussed when implementing the 3 prototypes. (2,7)
Please specify social innovation
The intervention was a governance novelty for the residents of Agege as it involved them in all stages of the design, implementation and evaluation. It was the first of its kind in Agege. As one of the researchers added: "The team adopted a “responsible innovation approach” in collaboration with the populations of Agege, a large slum in Lagos. The materials were of local origin and the community was heavily involved in the design, construction and maintenance of the prototypes,” (6)
Please specify novelty level of the innovation
There was no indication that the intervention was derived from previous initiatives.
Please specify Replicability/Transferability
Sources don't mention that the intervention was transferred to another new initiative or location. There is no data after 2018.
Impacts, benefits
Description of environmental benefits
-The green walls were shown to reduce internal air temperatures within the adjacent room by an average of 2.3°C, with occupants inside reporting to be comfortable 90%–100% of the time, against 23%–45% in the control room.
-The following local species were planted: Aloe vera (medicinal), Corchorus plants (locally called Ewedu - edible), Pumpkin leaves (locally called Ugu - edible) , Tropical nettle, Flowerless anti snake plants. (5, 7). The Agbo is known in West Africa for treating Malaria, and therefore is a valuable plant, whereas the waterleaf and bitter leaf are deemed good for lowering cholesterol and curing diabetes, respectively. (2) Studies show that the effective reproduction of the corchorus is reliant on the pollinator activity of insects such as the introduced honey bee (Apis mellifera), native honeybees or stingless bees. (8) The plants selected were native to Africa. The intervention created and restored habitat in urban areas for such plants.

Description of economic benefits
The sources mentioned that the majority of residents besides increasing their food supply also sold medicinal plants at the local market. Another aspect to mention is that during the intervention most residents that participated in its implementation were paid. (2)
Description of social and cultural benefits
The intervention increased food security and access to local food for a considerable number of people, most of them living already with less than 1 GBP/day. The added value of having edible and medicinal plants at hand was more important than their commercial value as the majority of interviewees claimed they would use the plants themselves rather than selling them. Considering 61% of expenditures in low-income groups in Nigeria are on food and beverage, any contribution in this area will be seen as highly valuable. (2)
Type of reported impacts
Indicators
Type of species; Temperature levels; Economic indicators (2)
Analysis of specific impact categories
Job creation: The NBS created ...
Environmental justice: The implementation of the NBS project resulted in ...
Negative impacts: Did the project cause any problems or concerns?
No information was found regarding negative impacts of the project
COVID-19 pandemic
As of 30 September 2021, no information regarding the Covid-19 pandemic was found in relation to the intervention.
Methods of impact monitoring
Evidence for use of assessment
Presence of an assessment, evaluation and/or monitoring process
Yes
Presence of indicators used in reporting
Yes
Presence of monitoring/evaluation reports
Yes
Availability of a web-based monitoring tool
No evidence in public records
Impact assessment mechanism
Name of any specific impact assessment tools
Unknown
Use of GIS in mapping impacts
No
Citizen involvement
Citizens involvement in assessment/evaluation
Yes
Mode(s) of citizen involvement in evaluation/assessment
Citizens involvement in the analysis of the assessment/evaluation
Yes
Please specify
Throughout the implementation of both phases there was continuous communication with the community members. In phase 1, 75% of participants saw potential for vertical farming and additional income, mainly women, and many of the interviewees said they would be comfortable for a VGS to be installed in their houses if maintenance costs and difficulties in implementing the system in rented houses making it dependant on landlord approval were allayed. As part of a list of recommendations for future development, 81% of interviewees suggested aesthetic improvements, such as adding flowers to the mix of plants to enhance the colours of the prototypes. 33% claimed the need for the community to be educated about VGS through seminars with 61% suggesting installing VGS in public centres to enhance visibility. 100% said affordability in building prototypes was essential whereas 78% claimed easy maintenance could be resolved with the use of edible plants, as cropping would prevent uncontrolled growth. General opinions about the prototypes were 100% positive. Prototypes were seen as a good idea and compact solution to produce edible and medicinal plants (55%) as well as a good community initiative (30%) which could add value to any household (10%). (2) Source number 2 discusses the assessments in detail.
Follow-up to the evaluation / assessment
Unknown
References
List of references
1. Cardiff University (2018), ‘Green walls’ in Nigeria, available at https://www.cardiff.ac.uk/news/view/1216499-green-walls-in-nigeria (accessed 1-10-2021)
2. Oluwafeyikemi H.Akinwolemiwaa, Clarice Bleil de Souzaa Luigi M.De Luca, Julie Gwilliama (2018), Building community-driven vertical greening systems for people living on less than £1 a day: A case study in Nigeria, available at https://doi.org/10.1016/j.buildenv.2018.01.022 (accessed 1-10-2021)
3. Environementanalyst (2018), Green walls reduce indoor temperatures by 2.3°C, finds study, available at https://environment-analyst.com/register?o=68224&productID=8&layout=main, (accessed 1-10-2021)
4. Responsible Innovation Network, Affordable Vertical Farm Systems in Lagos, Nigeria, available at https://www.responsible-innovation.net/case-studies/affordable-vertical-farm-systems-lagos-nigeria/ (accessed 1-10-2021)
5. Costing figures of the prototypes (please see attached)
6. Afrik21 (2019), Nigeria: Green Walls to overcome the heat in cities?, available at https://www.afrik21.africa/en/nigeria-green-walls-to-overcome-the-heat-in-cities/, (accessed 1-10-2021)
7. Environmental Journal (2018), Cardiff University develop ‘green walls’ for Nigeria, available at https://environmentjournal.online/articles/cardiff-university-develop-green-walls-for-nigeria/ (accessed 1-10-2021)
8. Queensland Government (no date), Species profile—Corchorus cunninghamii, available at https://apps.des.qld.gov.au/species-search/details/?id=12604 (accessed 1-10-2021)
Comments and notes
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