Tamil Nadu's food system relies heavily on an often-overlooked workforce: bees. As primary pollinators for crops like mango, coconut, sunflower, and cotton, bees are indispensable. Without them, crop yields could drop by 40%, and in some cases, up to 90%. However, across the state—from Kanyakumari, India's honey capital, to the Nilgiris—these vital insects are losing their habitats due to human-driven changes.
The Economic and Ecological Value of Bees
According to the Union Ministry of Statistics and Programme Implementation (MoSPI), ecosystem services provided by bees contribute about 10% of crop output, highlighting their immense economic value. India requires 150 million bee colonies to pollinate its 50 million hectares of bee-dependent crops, yet currently only 1.2 million colonies exist. This stark deficit underscores the urgency of conservation efforts.
Human activities such as land fragmentation, pollution, and chemical-intensive agriculture are taking a toll on bee populations. Research from Tamil Nadu Agricultural University reveals that bees, particularly Apis cerana indica, are shifting from flowers to sugary discarded food in urban dump yards, indicating critical floral scarcity. Bees are not merely agricultural inputs; they are essential to urban metabolism, akin to water drainage or bus routes.
Vision for Urban Bee Corridors
Imagine an uninterrupted flowering landscape—a green highway without concrete dead zones or pollution barriers—where bees can move, feed, shelter, and breed. A functionally built bee corridor along roadside strips, urban parks, green roofs, and utility areas ensures year-round foraging and a steady nectar supply. This concept is not new; many cities have implemented such corridors without requiring additional land.
Oslo created the world's first bee passage in 2015, helping pollinators navigate the city safely via continuous corridors of food and shelter, including rooftop gardens and cemeteries. Utrecht's 'bee stops' feature miniature gardens on 310 bus shelters, attracting bees and butterflies while improving air quality and cooling the urban environment. Melbourne and Singapore have also developed pollinator-friendly park networks.
Leveraging Existing Policies
Tamil Nadu does not need to start from scratch to initiate an urban bee corridor. The state already has a blueprint for urban environmental management; it simply needs to add a 'bee' lens. The Tamil Nadu Urban Greening Policy 2026 mandates urban local bodies to maintain at least 15% green cover. The Wetlands Mission highlights potential blue-green landscapes, while City Biodiversity Indexing identifies ecosystem service gaps. Partnerships between the Greater Chennai Corporation and the forest department have initiated tree-planting drives and dumpyard transformation projects.
Adding to this momentum, the 2026 Bee Corridor Initiative by the National Highways Authority of India is transforming highway strips into pollinator-friendly green pathways. This forward-looking initiative aligns urban greening with pollinator conservation. However, an inconvenient arithmetic remains: bee corridors need water to sustain continuous nectar sources. Creating bee corridors in water-stressed cities without integrated irrigation risks becoming a 'green illusion'.
The Greywater Solution
The solution lies in greywater—household wastewater from baths, sinks, and washing machines, which constitutes 60%–80% of domestic wastewater. Policies already support its reuse. The Combined Development and Building Rules mandate greywater recycling in new multi-storey buildings. The Sustainable Water Security Mission (SuWaSeM) targets 30% domestic wastewater reuse, and the 2019 Wastewater Reuse Policy recommends its use for public greening.
The challenge and opportunity lie in converging multiple programmes and departments under one sustainable mission. Urban bee corridors are not merely aesthetic planting projects; they require an overlay of policy, infrastructure, and governance. This calls for a state-level urban greening coordination committee under the Urban Greening Policy, with a dedicated pollinator corridor subcommittee to design and monitor implementation. SuWaSeM can ensure greywater irrigation. In short: 'No planting without plumbing; no green without grey'.
Standardization and Alignment
At the city level, both planting and watering methods must be standardized. Programmes such as the Atal Mission for Rejuvenation and Urban Transformation (AMRUT), Smart Cities Mission, and state greening initiatives should align with these design guidelines. The greywater-supported bee corridor creates a sustainable asset that accelerates the circular economy, agriculture, and livelihoods. Aligning green, blue, and grey development broadens Sustainable Development Goals (SDGs) to encompass sustainable water cycles and cities.
Tamil Nadu has always been a front-runner in innovative policies. This time, the state has everything it needs—just a connection of shared responsibility. A city that supports its bees can, in the long term, create a healthy food system, a secured water cycle, a diversified ecosystem, and a liveable city.
(The writer is a research associate with the Sustainable Development Goals Coordination Centre of UNDP, Tamil Nadu)
