This beautiful floating flower was introduced as an ornamental plant. Now it chokes rivers, dams, and creeks across the world
Nigeria is grappling with serious ecological and economic hurdles due to the spread of the invasive water hyacinth weed. This aggressive plant chokes waterways, disrupting transportation and fishing activities in multiple states. As ferry operatio...
Water hyacinth may appear to be a harmless plant with exquisite lavender blossoms, but it has caused ecological and economic problems throughout Nigeria. The invasive weed may grow rapidly, clogging rivers utilised by boats and fishermen, and depriving aquatic habitats of sunshine and oxygen. Now, some Nigerians are attempting to convert the problem into an opportunity.
How did a beautiful flower become a major problem?
Water hyacinth (Eichhornia crassipes) originated in the Amazon basin and spread globally as an attractive plant. In the right conditions, it may proliferate quickly, producing thick mats spanning rivers, lagoons, and lakes. According to National Geographic, more than 1 million hectares of Nigerian waterways in 20 states have been damaged, with the spread threatening the lives of an estimated 40 million people.
The plant has been particularly disruptive in Lagos, where waterways play a crucial role in local transportation and trade. The problem is not simply that the plant covers the surface. Dense mats can prevent sunlight from reaching underwater plants, while decaying vegetation can reduce oxygen levels and harm fish and other aquatic organisms. Boats, fishermen and waterways are paying the price
<p>Image courtesy: National Geographic/ Kasia Strek<br></p>
When did Water hyacinth become a major issue?
The scale of the problem became clear in Lagos in November 2023, when authorities suspended ferry operations at the Ipakodo Ferry Terminal in Ikorodu because water hyacinth was obstructing navigation. The Lagos State Waterways Authority warned that the infestation was creating a safety risk. “Due to the influx of water hyacinth obstructing smooth navigation of ferries,” the authority said, operations would be suspended until further notice.
Vanguard reported that alternative jetties were opened while efforts were made to clear the weed. The impact also extends to fishing communities. When the plants cover the water, fishermen can struggle to reach fishing grounds and may find themselves catching smaller fish that are harder to sell.
<p>Image courtesy: National Geographic/ Kasia Strek<br></p>
Why is the weed so difficult to control?
One reason is its extraordinary ability to reproduce. National Geographic reported that a single mother plant can produce hundreds of daughter plants, while the biomass can double within seven to 14 days. Its seeds can also remain dormant for years. The problem is not restricted to Nigeria. WIRED reported on a similar crisis at Lake Nokoué in Benin, where dense colonies have blocked waterways, disrupted fishing and crowded out native plants and wildlife. Researchers there have used satellites, drones and sensors to monitor the weed.
Can Nigeria turn the invasive weed into something useful?
Some entrepreneurs believe the answer may lie in harvesting rather than simply destroying the plant. In Nigeria, water hyacinth is being transformed into fertiliser, biochar, ropes, handicrafts and other products. One initiative works with fishermen to collect the weed before it is dried and processed, while artisans use its fibres to make products ranging from placemats to furniture.
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The approach could provide an economic incentive for removing the weed, but experts warn that harvesting alone cannot solve the underlying problem. As WIRED reported of the Benin project, researcher Danielle Wood said the goal was to make monitoring “affordable and operationally feasible” for communities dealing with the invasion.
Water hyacinth shows how a plant that looks beautiful in isolation can become destructive when introduced into an ecosystem without its natural controls. Nigeria’s challenge is therefore not only to remove the weed, but also to address the polluted, nutrient-rich waterways that help it flourish. Turning the invasive plant into useful products may offer a second line of defence — but protecting Nigeria’s waterways will ultimately require tackling the conditions that allow the weed to return.
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