Plants Suffering from Propane
I first moved my plants into the greenhouse on October 22. They TRHIVED for the next seven weeks, blooming beautifully and never dropping leaves, until last week when I first used my propane heaters. Prior to that I had been using electric heaters to heat the greenhouse. I try to keep the temperature above 50*. Most plants I grow are tropicals.
Last week we had very low temps in this area and I had to start up my propane heaters. These are non vented, Pro Com propane heaters. Within just a couple of days, the leaves of my plants started yellowing badly and they have now dropped many if not all of their leaves, and all the blooms have died and fallen off. The temps in the greenhouse during this cold spell never dropped lower than 45* and were usually no lower than 50*. I truly believe it is the propane that is causing this yellowing and leaf drop on my plants.
Does anyone have any suggestions of something I could do to prevent this from happening again? Should I have these heaters vented even though they are non vented heaters? Do you think the heaters might be faulty? Sometimes the smell is very strong in the greenhouse when I first open the door, and I can actually smell it when I walk up to the greenhouse some days. (My heaters in my home are hooked up to this same propane supply and I am used to the smell). Last winter I used these heaters almost exclusively to heat my greenhouse and my plants really suffered all winter. Then, I thought it was due to not having shade cloth on during the winter months and it being wayyy too bright in the greenhouse. This year I have shade cloth on the greenhouse and my plants were thriving until I first turned on the propane heaters last week.
I would appreciate any comments or suggestions. It's been painful to watch my plants drop all their leaves and blooms. Thank you for your help.