How to grow enough food for a family on a terrace?

A 200 sq ft terrace with 20–25 pots can supply 30–40% of a family's vegetable consumption. Focus on high-yield crops: tomato, chilli, okra, spinach, and beans. Use vertical trellises to double effective growing space. Succession-sow greens every 3 weeks for continuous supply. Supplement with farmer's market for staple grains.