to my knowledge, its pretty tought to poison a plant with co2.

however, the heaters may release monoxides or other gases (rediculously dangerous, and even more rediculously unlikely)

check your ph, watering, and feeding habits
hybridlove420 Reviewed by hybridlove420 on . HELP HELP[ HELP] what are the signs of co2 poisioning im trying to grow in a garage and my plants keep dying. ive grown good shit before. the temperature is right never rising a bove 80. im using one of those grow tents and i think the hot water heater and the house heater are piosioning my plants. all the leaves on this mother i got went from green to yellow in aout three weeks they are drying up and have some wierd looking spots on them the mother is in a 6x6 rock wool cube. i took clones from it they are Rating: 5