Organic mushrooms grown using Starbucks coffee grounds and cardboard: a Hong Kong farmer’s quest to build a sustainable business

• Urban Mushroom, a one-man operation in Tuen Mun, currently produces about 60kg a week of three types of oyster mushroom
• Founder Russell Kong explains how he settled on his crop of choice, how he keeps it eco-friendly and why there’s still plenty of trial and error in growing them