Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a Vietnamese Factory Uses Drones to Plant Mangroves
Transcript
- Lucas: If someone told you a factory that used to make disposable chopsticks is now one of the most efficient mangrove-planting operations in Southeast Asia, you'd probably ask how that even works. Luna: I'm already asking. Chopsticks to mangroves — that is not the pivot you see every day. Lucas: It's a small factory in the Mekong Delta, about a hundred and fifty kilometers south of Ho Chi Minh City. For twenty years they made bamboo chopsticks for export to Japan and South Korea. Then around 2022, the owner realized two things: demand was flattening because Japan started using disposable wooden chopsticks from domestic sources, and the delta was losing coastline at a scary rate — about fifty meters a year in some spots. Luna: So he looked at what he had — bamboo, precision cutting equipment, and a workforce used to working with thin, fragile materials — and thought, we can build something that drops seeds. Lucas: Exactly. They didn't go from chopsticks to drones overnight. The first prototype was basically a bamboo frame with a PVC pipe and a solenoid. It took them about eight months and something like forty thousand dollars in R&D to get a working version. But now they're on their third generation, and it's genuinely impressive. Luna: What does the current model look like? Is it a modified commercial drone or fully custom? Lucas: It's a hybrid. They take a DJI M600 airframe — that's the heavy-lift platform — and replace the entire payload system with a custom seed-dropper they machine in-house. The dropper holds about two hundred mangrove seeds per load, and it releases them one at a time using a rotating disc, kind of like a seed drill you'd see on a farm, but miniaturized. The drone flies about ten meters above the mudflats and drops seeds in a grid pattern. Luna: Two hundred seeds per flight — that seems low. How many flights can they do in a day? Lucas: They run two drones simultaneously, each doing about twenty flights per day. That works out to roughly eight thousand seeds per drone per day, so sixteen thousand total. But the number that matters more is the survival rate: about eighty percent of those seeds actually root and grow. Compare that to hand-planting, where a crew of ten people can plant maybe two thousand seedlings per day with a survival rate around sixty percent. The drone method is eight times faster per labor hour and yields better results. Luna: How does a chopstick factory know how to optimize seed survival? That's biology, not manufacturing. Lucas: They partnered with a local university — Can Tho University — which had been studying mangrove germination for years. The factory's role was to engineer the delivery mechanism so the seed lands at the right angle and depth. If it lands sideways or too deep, it won't root. So they had to design a dropping mechanism that orients the seed vertically as it falls. That's the kind of precision problem a chopstick factory is actually well-suited to solve, because they're used to tolerances of a few millimeters. Luna: So the pivoting was partly about skills, not just equipment. Lucas: Completely. The workers already understood how to handle bamboo without splitting it, how to machine small parts with tight tolerances, and how to do quality control on natural materials that have variable density. Those skills transferred directly to making seed pods—they use a biodegradable bamboo composite for the pod casing, which dissolves in water after about two weeks. Luna: And the business model — they're not selling the drones, are they? Lucas: No. They operate as a service. They contract with local governments and conservation NGOs to plant mangroves along specific sections of coastline. The customer pays per hectare planted. In 2025, they planted about four hundred hectares — that's roughly nine hundred acres — and they're on track to do six hundred this year. The revenue from planting fees now accounts for about sixty percent of the factory's income. The remaining forty percent still comes from chopstick production, but that's shrinking. Luna: And the carbon credit piece — I've heard mangroves are one of the best natural carbon sinks. Are they selling credits on top of the planting contracts? Lucas: That's actually the most interesting part. Mangroves sequester carbon at a rate roughly four times higher than tropical rainforests per hectare, because they store a lot of carbon in the soil below the waterline. This factory registered its planted areas under a voluntary carbon standard — Verra, the Verified Carbon Standard — in early 2025. They issue credits based on third-party verification of tree survival after three years. The first batch of credits isn't expected until 2028, but they're already pre-selling them to companies in Singapore and Japan at around fifteen dollars per ton. Luna: Fifteen dollars is on the lower end for voluntary carbon credits. But if they're planting six hundred hectares a year and each hectare can generate maybe ten to fifteen credits annually once mature, that's a decent revenue stream down the line. Lucas: Exactly. And those pre-sale contracts give them operating capital now. They've used that money to buy a third drone and to build a small nursery for growing mangrove seedlings in case the direct seeding method doesn't work in certain soil conditions. They're basically building a diversified restoration business on top of a manufacturing base. Luna: What about the regulatory side? Flying drones in coastal zones — especially in a country with sensitive security concerns — can't be straightforward. Lucas: It's complicated. Vietnam's Civil Aviation Authority requires a permit for any drone operation that isn't recreational. The factory had to get a special exemption for environmental restoration work, and they're limited to flying during daylight hours and below a hundred meters. They also have to file flight plans twenty-four hours in advance. The owner told me that paperwork is actually their biggest bottleneck — it limits how many sites they can cover in a week. Luna: That's the kind of friction that doesn't show up in the tech demos. But it sounds like they're scaling anyway. Lucas: They are. They're working with the provincial government to get a standing permit for the entire planted area, which would cut the approval time from a day to about an hour. If that goes through, they think they can double their planted area next year without adding more drones. Luna: I want to come back to the chopstick side for a second. How did the existing workers react to the shift? Not everyone wants to go from making tableware to flying drones. Lucas: The factory has about forty employees. Roughly half now work on the drone operation — piloting, maintenance, data processing. The other half still do chopsticks. But the owner says there's been zero turnover. He offered retraining to everyone, and the ones who switched actually got a pay bump because the drone work requires more skill. A few of the older workers who'd been there for fifteen years chose to stay on chopsticks, and that's fine — they're still profitable. Luna: It's a nice example of a just transition at the factory level. Not everyone has to become a drone pilot. Lucas: Exactly. And the community benefit is real, too. The mangrove plantings have already reduced wave energy hitting the shoreline by an estimated thirty percent in the areas they planted two years ago. Local fishermen say they're seeing more fish and crabs near the restored mangroves. The factory's pivot is creating ecological value that the chopstick business never could. Luna: So a factory that was facing a declining market found a way to use its core capabilities for something completely different — and it's working. Are there other factories in the region copying this model? Lucas: A couple. There's a furniture factory in the same province that's started making bamboo seed pods for them. And a metalworking shop in Da Nang is developing a cheaper drone frame using aluminum instead of carbon fiber. The original factory is actually sharing its seed-dropper design openly — they put the CAD files on GitHub last year. They figure the faster the coastal zone gets restored, the more carbon credits they can sell. It's not zero-sum. Luna: There's a lesson in here about manufacturing resilience. The factory didn't need a government grant or a venture capital round. They used their own cash flow, their existing skills, and a clear environmental problem to create a new revenue stream. Lucas: And it's replicable. Any factory with precision machining, a willingness to partner with researchers, and a nearby ecological challenge could do something similar. You don't need to be a tech startup. You just need to look at what you already know how to make and ask: what problem could this solve elsewhere? Luna: Stories like this remind me why we do the show. It's one thing to talk about net-zero targets in the abstract. It's another to see a forty-person factory in the Mekong Delta actually making it happen. Lucas: Absolutely. And if these conversations have moved your work forward in some small way — given you an idea, shifted how you think about your own factory or supply chain — a couple of dollars a month is genuinely what keeps these going. That's buy me a coffee dot com slash fexingo. It makes a real difference for a small, ad-free show like this. Luna: Yeah. We don't run ads, we don't have a big network behind us — it's just us and our listeners. So if you've gotten value from the podcast, that's the best way to keep it going. Lucas: And the mangroves we talked about — they'll be absorbing carbon for decades. That factory's decision in 2022 is still paying off. I guess that's the real takeaway: sometimes the most impactful manufacturing innovation isn't a new material or a faster robot. It's a willingness to look at your shop floor and ask, what else can we do? Luna: Next episode, we're looking at a factory in Ghana that turns plastic waste into paving stones. That one's got some wild numbers on compressive strength. Lucas: Can't wait. We'll see you then.