A small home “plant factory” is feasible with three pillars:

 A small home “plant factory” is feasible with three pillars: (1) microgreens (7–12-day cycles), (2) leafy greens/herbs (30–45 days), and (3) mushrooms (low-light tolerant), enabling quick cash flow. At S scale (one 120×45 cm rack, 3 LEDs, 12 trays), initial cost is ¥50,000–70,000. With 10-day cycles × 3 per month → 36 trays → 50 g × 6 packs/tray at ¥350–450 each, monthly revenue is ¥76,000–97,200; after seeds, materials, electricity, etc. (~¥20,000), gross profit is roughly ¥55,000–77,000. M scale (two racks) needs ¥90,000–150,000 for ¥70,000–180,000/month; L scale (≈2 tatami) ¥180,000–350,000 for ¥150,000–400,000/month. Gear: metal rack, LEDs at PPFD 200–300 with timers, trays/media, circulation fan, temp-humidity/pH/EC tools, sanitation items. Sales: sample nearby cafés/bistros (10) and offer fixed-weekday subscriptions; add household subscriptions. SOP: daily checks/watering; on ship days, dry harvest, weigh, label; weekly cleaning/disinfection. Risks: mold (avoid over-seeding/over-moisture), pests (insect netting), contamination (workwear, fixed tool layout), humidity/odor (ventilation/dehumidify), outages (backup fan). Regulations: selling fresh leaves typically doesn’t need a food business license, but processing may—consult your local health office; label name, weight, date, storage, contact. 30-day plan: (1) buy gear and run 12-tray trial; (2) price sheet/photos; (3) samples to secure weekly routes; (4) focus on top SKUs and formalize seeding schedule. Extensions: NFT for lettuce output, add a mushroom tier, RO water for stability.


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