Since due to a blood clot in my hand I haven't been able to put my 9' x 12' greenhouse with polycarbonate panels together yet I bought a small greenhouse from Amazon (see photos) for my Plumeria, Adeniums and a few other plants. I use a propane heater on the lowest setting at night to keep things warm but the temp seems to rise to 100+ in there. Will that high a temp cause them any harm? It has a two roll up windows, one on each side so I'm thinking I might roll them up to get some cool/cold air circulating inside. I also have one cutting in the greenhouse. Will it go dormant like the big ones or should it be watered periodically throughout the winter?

Hi Chris @chris1948, Over 100 could be too warm inside, see if you can keep it in 85-95 range. I am also trying to root plumeria in the winter in florida and it has been slow. Don't water too much, just one time and then only if needed after that.

Thanks @FL_tennis_gardening I've got the temp down into the 80s by leaving the window open at night. I've also got a small fan running inside now to circulate the air.

I think they can take the heat, the issue would be if you can sustain that heat all winter long and also provide strong light as needed. I remember seeing greenhouses here in the bay area, specifically for succulents. It is really sustained dry heat inside, and there is continuous fan blowing to facilitate ventilation around. Then on the conservatory in San Francisco, for the tropicals, distinct humid heat inside.

Plumeria falls in the tropical succulent aspect...so I am thinking it is good you can provide the warmth it needs, but the aspect of humidity in winter will be very dicey, so be careful they do not get fungal issues when you open up the windows and cold air touches them. So easy to invite black rot once they get a touch of cold air.

Thanks Tarev, so far the humidity is staying really low in the little greenhouse. I'm ordering another fan so I can keep one going during the day while the other one charges then swap them out. From what I can see so far they're doing good. I've got them stacked bare root as you can see in the photos. Last year when I had my bigger greenhouse in pretty good shape I had them in 15 gal pots about 1/2 full of perlite, 8 to a pot. Not so lucky this year. If I didn't have this blood clot I'd have gotten the new one up up with the polycarbonate panels. Maybe I'll get to work on it in the spring.