How much does it cost to grow one cannabis plant indoors?

Here's my actual cost breakdown for one autoflower plant:

• Seed: $8-12
• Soil + perlite: $15
• Nutrients (enough for several grows): $30/grow = ~$8
• Electricity (100W LED, 18hrs/day, 75 days): ~$12
• Water: negligible

Total per plant: ~$43-47

Average yield: 2-4 oz = $400-800 at dispensary prices

ROI: 10-18x return

That doesn't include startup equipment, but after your first harvest the tent and light are paid off.

I tracked my costs for a full year. 4 plants per cycle, 4 cycles. Total spend including equipment amortization: $1,200. Total yield: 48 ounces. That's $25/oz all-in. Dispensary near me charges $250/oz. I save over $10,000 a year growing my own.

The math is a no-brainer once you have equipment. Seeds from Royal King Seeds are $8-15 each. One seed produces $400+ worth of cannabis. Even a terrible first grow pays for itself.