How hot is too hot???

Discussion in 'Growing Marijuana Indoors' started by andrew256, Jun 8, 2009.

  1. I visited a grow room the other day and the temp was 81F at canopy level. Too hot?
  2. Nope, under 85F is fine. Above that and the plants have difficulty uptaking CO2, which is why you use CO2 enhancement if you have to run high temps.

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