The addition of carbon dioxide gas into an enclosed grow space to elevate CO2 concentrations above ambient (~400 ppm), typically to 1,000–1,500 ppm, to accelerate photosynthesis and increase yields.
Dakota notes the CO2 was 'tapered down towards the end' of the run, a best practice to reduce CO2 input as plants approach harvest. The CO2 room is described as 15 ft x 7.5 ft. The whole run was considered the most dialed-in setup to date.
Discussed in: Ep 005