"Water footprint" gets thrown around a lot in sustainable-fashion marketing, often with numbers that are hard to trace back to a real source. We'd rather show our working. Below is what credible, citable research actually says about cotton's water use and about where bananas' water footprint goes — and an honest look at where banana fiber fits into that picture.

The water footprint concept itself comes largely from Professor Arjen Hoekstra's work at the University of Twente, whose research is the basis for the commonly cited figure that a single cotton t-shirt takes roughly 2,700 liters of water to produce — most of it for irrigating the cotton plant itself, not for dyeing or weaving later. Cotton is a crop grown specifically to be turned into fiber, so essentially all of that water is attributable to the fiber, not to some other product.

Bananas are a different story, and it starts with what the banana plant is grown for. According to the Water Footprint Network's figures, published via the FAO World Banana Forum, the global average water footprint of bananas is about 790 cubic meters per tonne of fruit, and roughly 99% of that comes from the agricultural production phase — irrigating and growing the plant itself. That number is calculated for the banana crop as a whole, because the plant is grown to produce fruit. The pseudostem — the thick, trunk-like stalk we extract fiber from — is what's left standing in the field after the bunch of bananas is harvested. It isn't a separate crop grown for fiber; it's agricultural residue from a harvest that already happened, residue that in most of Sindh is otherwise left to rot, dumped in canals, or burned (we go into that waste problem in more detail in our piece on banana fiber sourcing in Pakistan's banana belt).

That's the honest distinction: cotton's water footprint is incurred specifically to produce the fiber. The water behind a banana's growth is incurred to produce the fruit, whether or not anyone ever turns the leftover stem into fiber. Using that stem doesn't add a new irrigation bill — it just makes use of something that already existed.

We're not going to tell you banana fiber is a "zero water" material, because it isn't. Turning a harvested pseudostem into usable fiber still involves washing, retting or decorticating, and drying — steps that use water at the processing stage, after the plant has already grown. We haven't independently measured the exact volume of water our own extraction process uses, and we're not going to invent a number to make a cleaner comparison. What we can say, grounded in the sourcing above, is that the fiber itself doesn't require a dedicated irrigation footprint the way a crop grown specifically for fiber does.

Natural Raw Banana Fibers

100% banana pseudostem fiber, sold by the kilogram at PKR 1,360/kg, extracted directly from post-harvest waste stems in Sindh. View the product page.

Honesty callout: This is a comparison of what's independently published about cotton and about the banana crop as a whole — not a side-by-side lab or life-cycle study of our own extraction process against a cotton mill's. If you need a verified life-cycle assessment for a specific buying decision, we'd point you to the primary sources linked above rather than a number we haven't tested ourselves.

For more on how banana fiber breaks down at the end of its life (a related but separate question from its water footprint), see our biodegradable materials guide. Browse raw and combed fiber in our Raw Materials collection, or get in touch about bulk orders through our wholesale page.

Written by Dr. Qasim Siddiqui, Founder & CEO, The Natural Fiber Company. Contact: info@naturalfibercompany.com.