Turning Old Clothes Into Biochar – A Circular Fashion Breakthrough

What happens to a garment when it truly reaches the end of its life?For most fashion brands, the answer is landfill. For Wellington-based label Kowtow, the answer is something far more ambitious: transform it into biochar, and put it back into the earth.In this episode of Progress in Practice, Go Well Consulting's Nick Morrison sits down with Emma Wallace, Managing Director of Kowtow, to explore one of the most genuinely innovative end-of-life solutions we've seen in the New Zealand and Australian fashion industry. Kowtow — a label built from the ground up on fair trade organic cotton and ethical manufacturing — has completed the first trial of their biochar initiative as part of what they now call the Regenerate Programme.By heating returned garments in a retort kiln through a process called pyrolysis, they are transforming 100% organic cotton clothing into a carbon-rich biochar that, when activated with seaweed tea and mixed into soil, sequesters carbon, supports water retention, and provides a home for beneficial soil microorganisms.This isn't a PR stunt or a future aspiration. The trial has been run, the biochar has been tested, the tomatoes in the Kowtow workroom grew measurably taller. This is real.Emma walks Nick through the full picture — from the founding philosophy that has guided Kowtow for two decades, to the grassroots partnerships with a Hokianga farmer and a local biochar distributor that made the trial possible. Together, they unpack why this initiative matters well beyond the fashion industry, and what it means for any business grappling with the genuine hard work of circular economy implementation.Key topics covered in this episode:What biochar is, how it's made through pyrolysis, and why it's a powerful soil amendmentHow Kowtow's Regenerate Programme collects, decommissions, and prepares end-of-life garments for biochar conversionThe science behind carbon sequestration — and why biochar outperforms composting for locking carbon into the soilKowtow's 20-year journey through circular economy principles: from organic cotton selection, to plastic-free garment redesign, to repair and resale, and now biocharThe grassroots partnerships — including a Hokianga farmer and The Good Carbon Farm — that made the trial possibleThe commercial realities of sustainable fashion and what product stewardship really costs a small businessThe potential for the initiative to scale and attract industry partnersWhy small cultural shifts — like switching from pens to pencils — matter in building an organisation that can solve hard problemsWhether you're a sustainability professional, a business leader exploring circular economy models, or simply someone who cares about where your clothes end up, this episode is a masterclass in what it looks like to keep pushing when you could have stopped.To watch this episode on Youtube check it out here.To learn more about Kowtow and the Regenerate Programme, visit their website.And to find out how Go Well Consulting can help your organisation navigate its own sustainability journey, visit the Go Well Consulting website here.