Comment: OK will be very careful. The area

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In reply to comment: Great but use it very carefully. (see in situ)

OK will be very careful. The area

is a porch that is away from the main living area. It has a fan and window door ventilation. Will experiment.

CO2 might not be for everyone, if the garden is on the kitchen counter under the top cupboards or other living area. My gardens have been doing really well even without CO2. But I like to experiment so will try CO2.