A mushroom cultivation unit grows oyster mushrooms (Pleurotus ostreatus) on paddy/wheat straw substrate in climate-controlled growing rooms. Each batch cycle is 45 days- substrate preparation and sterilisation (3 days), spawn inoculation and spawn run (15–18 days in dark), and fruiting/harvest (15–20 days, 3–4 flushes). The key differentiator vs. other agri businesses is the short production cycle (45 days) and very high per-kg revenue (Rs. 150–200/kg fresh). The main challenge is contamination control- without a sterile inoculation environment (laminar flow hood) and properly sterilised substrate, 30–50% batch failure is common. Technical training at ICAR-DMR Solan is mandatory before investing. Dried oyster mushroom (12–15% moisture from fresh) commands Rs. 700–1,000/kg and provides export access via APEDA.