How this S African farmer built a sustainable farm on 5,000 sqft

In Soweto, South Africa, where land is scarce, Ngcebo N. Zungu has built a low-cost sustainable farm on a rocky patch of land. He uses old tyres and PVC pipes as planting containers, repurposes discarded materials, turns farm waste into compost, and an old bathtub to produce liquid fertiliser. He earns from selling veggies, poultry, fertilisers, seedlings and more.