It's my understanding liquid propane also emits gases as biproducts of combustion, similar to the other gases. Carbon monoxide is a given, thus the instructions to burn only in a well-ventilated space. To the best of my knowledge, only heaters directly vented to outside are safe to use with plants like in greenhouses or your own house. It's also not just bud-drop that you should be worried about but gassing yourself, as well.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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