I have been growing a gardenia outside in a pot. It has done OK with some light freezes down to 31f. Should I bring it in when things go down to the mid 20's? Or will it do OK?
they can survive in the ground in my zone with temps in the 20's but that is with an insulating soil cover. containers don't provide that.
i would move it inside before mid-20's are expected.
as an example, i lost a large, established in-ground one years ago when it dropped to 18 degrees. others that i grow have survived short duration mid-to-upper 20's in successive winters.
I bring mine in when it hits 40F. Anything colder, and it could freeze, especially when in a container.
Another reason is, when kept cold for long periods, it seems some plants are more prone to leaf drop, especially if brought inside, in a warm house. If possible, do it gradually. When days are 50's and 60's, keep outside, but when night temps drop below 45F, bring inside. Do this a week or two. Or if you have a cool room, do it at once. Good luck, Toni