It is 51F on the kitchen windowsill at the moment. Wish it was higher and i'm still trying to sort out which Phals are cool tolerant and which ones aren't.

Too cool for some and they are located inside in a warmer place.

Having a bit of winter sun does make a difference.

My growing area dips to 52-54 F. in winter, and my phals tolerate it--though I have to say I switched all my plants to plastic pots and bark mix--those phals that were in clay/sphagnum just stayed too damp.
Nicole

Phals are warm growers - I would not let your plants get below 55 degrees at night in the winter (some folks say 58), and the daytime temps should be at least 10 - 15 degrees warmer. They will be prone to rot at colder temperatures, and will probably not thrive. If you have any summer bloomers, they would appreciate even warmer temperatures. Hope you can find a warm spot for these plants - they'll thank you for it!

jeanne

I totally agree with Jeanne. The biggest problems I have wintering over Phals are the temps. I have learned which ones can tolerate cool rooms and which can't (those died). Most can tolerate it for a month or so, but more than that you will get rot. Unless you know which phals can tolerate cool temps, I would try to keep them warmer. Also keeping them as dry as possible over winter helps.

Jane

Thanks everyone for your input, i was thinking along the same lines myself that it might be too cold for the phals. I guess i'll probably put Christmas, Thanksgiving and Easter cactuses there instead, along with my sanseverias. Your input is the beauty of these forums,so much wisdom and experience, an e mail away! Thanks again...bob

Hey Bob!
I was re-reading your post and realized your space seems to stay pretty cool during the day, too. I guess part of the reason my phals tolerate the cooler nights is that it usually gets into the hi 70's to even 80's during the day--great passive solar windows...
Nicole

Hi Nicole, yes, those rooms do tend to stay on the cool side as they are "spare rooms" in the house they do have heat but i keep it turned DOWN up there to conserve energy, iam sure this winter with energy costs up so high, iam not going to jack the heat up in those rooms unless i have to. Putting the plants up there, just would have freed up some room downstairs so that i could buy more plants. HaHaHa