| I do not have any personal experience with propane heating and plants.
The problem may arise if there is insufficient oxygen to burn the gas because it WILL produce carbon monoxide (CO) instead of carbon dioxide(CO2). Incomplete burning of the gas can cause some serious problems to people ( CO forms an irreversible bond with blood pigments)
I don't know if there will be any ill-effects on the plants if there is a bit of leak of the gas.
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