You probably should have "checked" a few of the following before now but at least this may serve as a reminder as you get your greenhouses facility up and running for transplant production. Heaters... Every spring there are some problems that can cause irreversible plant damage. If the burners in your furnaces do not get sufficient fresh air for combustion, they will start emitting gases that are toxic to the plants. Tomatoes are particularly sensitive to the "ethy-lene" types of gases that cause stunting, terminal growth distortion and/or leaf cupping.
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