YvonneD wrote:
What is the lowest night time temp that orchids can tolerate? I have
phals in front of a large window. They get morning sun only but at
this time of year the sun is fairly weak.

I have the daytime temps at 69 and night at 67. That's one degree
lower than usual. Is that OK?

thanks

Most orchids require a 10 degree change in day/night temps, so if your
daytime temp is 69 your nighttime temps should be around 59.

K Barrett