This is a new pleurothallis

masd.

Do you have a garage? Or how about a spare room? Close the heat vent and the interior door and open a window?

I have a tool room, I'll try it and hope that my cats dont jump on them! Thanks

how long have you been growing orchids?

My Australian Native hybrids are all grown outside in Bayside Melbourne Australia.
Last winter I bought some material on ebay and placed over my plants on nights when frost was due., eg Plant Protection Fleece
Plant Fleece is a white, nonwoven polypropylene material designed to aid in protection from insect damage, frost and extreme weather.

The material insulates the area under the fabric while allowing water to pass through at the same time trapping in heat. It is 100% breathable so it doesn't have to removed during sunny days.

The material also has a high degree of light transmission to assist in the growing process.

I also considered buying a product called Envy which is a spray on and gives, I think, an extra 4 degrees Celsius protection. But being by the Bay the temp doesn't get that low.

My collection has grown enough that I can't move them inside and it gets to frost temperatures a few times a year in SW florida...my plan this year is to bring them in on the patio right next to the house because the house will radiate a few degrees higher and keep them protected...I also plan to cover them with a blanket or sheet overnight to help keep some warmth in.

I don't know, but I hope the best for them. I had my phal orchids out of their pots for like a week letting them air and stretch their roots, misting them daily. Today I trimmed the brown off the roots and put them in pots. The one I got for ten bucks had time to show which roots were keepers and it was left with a few. So I have a leaf or two that is weak, and had some roots that looked plump but were broken and simply must of had the wrong fertilizer applied by the florist. I got a chance to see which roots the orchid seemed to be using. Mine might die. Anyway the black you have on your leaves might be from way too much moisture, but I am not familiar with the type you have growing. Epiphyites, forgive the spelling, seem easy and can live outa their pots for a few days in my area, indoors. Of course now these phals are my little faves and if they die I'll be crushed, but
it will be partially my fault. Can you bring yours indoors and just dote on learning about them? Maybe that would help? What are yours growing in? A lot of my phalenopsis roots had to go, several hours ago.

I don't know much about cold weather orchids. The phal likes it chilly, like in the 50's-60's degrees f, which what it usually is indoors during winter anyway, so I hope for the best. I stay away from peat moss personally, but might use a little if I get a keiki. I prefer keiki's to flowers most of the time. Do those the o.p. has keiki?

but if it's fungal or bacterial the o.p. has, wouldn't it look like that? I did fertilize mine, the roots got enough mist throughout the out of pot experience to get fertilized. I am not going to try terrestrial orchids, but I do have a lithophyte on the way, an austriallian cultivar, dendobrium kingianum, and would like to mount it, but they like phalanopsis seem to fair better in pots. I guess a vanda would suit me better. When I get the dendo, if it ever arrives, I will post a pic. One more pic of the phal. I think it'll make it. two more roots on it might need a snip, but for now I am waiting it out.

It's probably got nothing to do with orchids but in the old days farmers used to pour cold water around corn if there was a frost during the growing season to save the crop.