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  1. C

    Does too much CO2 kill vegatation?

    Ask google and you get a million different answers.. including many that say plants need Oxygen at night to survive. Yes.. pure oxygen can kill a human.. but don't divers breathe it?? We are trying to keep greenhouses warm and non vented infrared propane heaters (with a thermostat) are not...
  2. D

    Autoflowers and Non-Auto Light Cycle

    Hi, Wondering if someone can help. I have some autos on a 16/8 light cycle which are flowering and one non auto feminized which isn't. To trigger flowering I need to shorten the light cycle for the non auto but I don't want to affect the autos by reducing light. At the moment I don't...