Trees for City, Thiruvananthapuram, Kerala, India

Why Trees?

Urban and coastal regions are increasingly at the forefront of climate vulnerability, and Thiruvananthapuram exemplifies this growing challenge. Over the past decade and a half, the city has experienced measurable shifts in key climate parameters, with a current climate change severity score of 48, placing it within the high severity category. This reflects a clear trend of escalating climate stress driven by changing temperature and precipitation patterns.

The vulnerability is further intensified by its coastal geography. Kerala’s 590-kilometre coastline along the Arabian Sea is densely populated and highly exposed to extreme events. Thiruvananthapuram has recorded some of the highest coastal erosion rates in the state, with nearly 63% of the coastline undergoing erosion and significant land loss already observed. Events such as Cyclone Ockhi and the Kerala floods have further highlighted the region’s exposure to climate-induced disasters, increasing risks to both ecosystems and communities.

In this context, the “Trees for City” initiative at St. Xavier's College, Thumba is nature-based solution to strengthen local stability. By transforming underutilized and ecologically suboptimal land into biodiverse green zones, the project aims to improve soil stability, enhance water infiltration, and create a more climate-resilient landscape within the campus.

Through the planned plantation of native, fruit-bearing, and medicinal species, the initiative will not only restore ecological balance by replacing low-benefit vegetation, but also support biodiversity by creating habitats for birds, pollinators, and beneficial organisms. At the same time, increased green cover will help regulate microclimatic conditions, reducing heat stress, improving air quality, and creating a more comfortable environment for daily campus life.

Beyond environmental restoration, the project is designed to generate tangible social and educational value. The integration of fruit and medicinal species will contribute to local food and wellness systems, while the campus itself will evolve into a living learning ecosystem where students can actively engage with sustainability in practice.

As cities increasingly adopt nature-based solutions to address climate challenges, this project demonstrates how institutional landscapes can move beyond passive green cover to become active, functional ecosystems, contributing to stability, liveability, and long-term sustainability in Thiruvananthapuram.

Tree Species

1. Mango (Mangifera indica)

Mango is a high-value fruit-bearing tree well-suited for the coastal conditions of Thiruvananthapuram. Its dense canopy provides shade, helping reduce heat stress and improve microclimatic conditions within the campus.

It contributes through:

• nutritious fruit production supporting food systems
• long-term economic and nutritional value
• enhancement of green cover and biodiversity

Mango plays a key role in creating productive landscapes that combine ecological and community benefits.

 

2. Jackfruit (Artocarpus heterophyllus)

Jackfruit is a native, climate-resilient species widely adapted to Kerala’s humid coastal environment. It supports soil stability and thrives in varied conditions, making it ideal for campus plantations.

It is valued for:

• high-yield, nutrient-rich fruit
• supporting local food security
• large canopy providing shade and cooling

Jackfruit enhances both ecological resilience and nutritional value within the plantation.

3. Guava (Psidium guajava)

Guava is a fast-growing fruit tree that adapts well to diverse soil conditions. It is particularly suitable for structured plantations in institutional spaces due to its manageable size and productivity.

Key benefits include:

• early fruit yield and regular production
• support for small-scale consumption and use
• attraction of birds and pollinators

Guava contributes to biodiversity enhancement while offering quick returns in terms of fruit production.

4. Neem (Azadirachta indica)

Neem is a hardy, medicinally important species known for its air-purifying and pest-repellent properties. It is well-suited for improving environmental quality in institutional spaces.

The tree is important for:

• natural air purification and pollution reduction
• pest control and ecological balance
• medicinal uses and traditional health systems

Neem strengthens both ecological health and awareness of traditional plant-based knowledge.

5. Amla (Phyllanthus emblica)

Amla is a nutrient-rich, medicinal fruit tree that performs well in tropical climates. It contributes to soil improvement while supporting health and nutrition.

It provides:

• vitamin-rich fruit with medicinal value
• opportunities for local consumption and use
• resilience in varied environmental conditions

Amla integrates ecological restoration with wellness and nutritional benefits.

6. Tulsi (Ocimum tenuiflorum)

Tulsi is a widely valued medicinal herb known for its therapeutic and ecological benefits. It is ideal for creating dedicated herbal garden spaces within the campus.

It is significant for:

• medicinal and wellness applications
• improving air quality and repelling insects
• promoting awareness of traditional herbal practices

Tulsi plays an important role in developing a holistic, health-oriented green campus ecosystem.

 

Social impacts

The Trees for City project offers significant social benefits for students, faculty, and surrounding communities. This project will create multiple engagement particularly in activities such as nursery development, sapling preparation, site preparation, plantation, watering, and maintenance. These activities will involve students, campus staff, and local community members, generate local engagement while build practical skills in sustainability and ecological restoration.

By transforming underutilized land into productive green zones, the project strengthens the relationship between people and nature within an institutional setting. It promotes active participation, promoting environmental responsibility among stakeholders.

Trees will improve campus life by creating shaded, cooler, and cleaner surroundings thereby reducing heat stress and enhancing overall well-being. The inclusion of fruit, herbal, and medicinal species will also provide access to natural resources that support nutrition and traditional wellness practices.

As a living learning ecosystem, the campus will enable experiential education, allowing students to engage directly with biodiversity, sustainability, and climate action by bridging the gap between theory and practice.

Ecological Benefits

Coastal urban landscapes in Thiruvananthapuram are increasingly vulnerable to climate stress, including rising temperatures, coastal erosion, and reduced ecological stability. Through the plantation of native, fruit-bearing, and medicinal species, the project will help restore soil health and stability across sandy coastal terrain, water infiltration and conservation of the local water table and biodiversity, including habitats for birds, pollinators, and beneficial organisms.

The structured plantation approach by dividing the campus into fruit forests, herbal gardens, and medicinal zones will create a diverse and functional ecosystem. Increased vegetation will contribute to improved microclimatic conditions such as reduced ambient temperature and heat stress, improved air quality and reduced particulate matter, enhanced moisture retention in soil and natural shading and wind buffering. These improvements will transform the campus into a green ecosystem while supporting long-term environmental sustainability in a coastal setting.

Economic Impact

Economically, the project contributes by creating both immediate and long-term value within the campus and surrounding community. During the implementation phase, activities such as land preparation, planting, and maintenance generate local employment opportunities. The plantation of fruit-bearing species such as mango, jackfruit, and guava will provide long-term economic and nutritional benefits through fruit production. These resources can support local consumption, institutional use, and small-scale value addition. Medicinal and herbal plants such as neem, amla, and tulsi add further value by supporting traditional wellness practices and potential small-scale utilization. In addition, by improving environmental quality and developing a green campus, the project enhances the overall institutional value and attractiveness of the campus.  In the long term, the initiative builds a self-sustaining, productive landscape that integrates ecological restoration with social and economic value, contributing to a more sustainable and resilient urban ecosystem.

References

 

1. Climate change severity score and long-term climate trend in Thiruvananthapuram
2.  Climate Change – Thiruvananthapuram
3. Air quality and environmental stress indicators in Thiruvananthapuram (supporting urban environmental context)
4.  Air Quality Dashboard – Thiruvananthapuram
5. Coastal vulnerability, erosion, land loss, and climate-induced migration in Kerala
6.  Experiencing Climate-Induced Migration: The Case of Kerala