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I think we have been through this before but I couldn't find the answer.

It's spring. Temperatures have been fluctuating upwards for a while. I finally moved the inside trees outside last week. Tuesday and Wednesday the highs and lows are 71F/22C - 43F/6C and then 74F/23C - 48F/9C. They will probably not drop down cold until October.?

The indoor trees are baobab, key lime, jabuticaba, and willow leaf ficus. Should any or all come in for those come inside for the few hours it will be below 50F/10C?

The ficus and jabutica are both pretty large and my back does not look forward to carrying them around, but it will sacrifice for the greater good. The ficus, as always, dropped leaves all over the floor but has just started to leaf out, with exposure to real sunlight. The key lime evolved in Key West, Florida, where the lowest yearly temperature is 65F/18C.

Yes, I remember you asking the same thing last spring and proboably at least a few more times before. Nothing wrong in that, you have the right to be worried about your trees.

As I see it there are only one situation that is directly lethal. That is trees that are not frost hardy in frost conditions. They just do not have any strategy for handelling frost and die directly.

There are also some species that are frost hardy but late frost will abort flowering. Peach beeing the one most people know.

Those examples is where we obviously can determin negative effects on temperatures. For all other species the effect on temperatures is a lot more slow and less easy to see. FEX, my experience on chinese privets. I have an old one that was spending its life outdoors in summer. It have always grown, but not fantastic. Then I have several cuttings that stays in the greenhouse and grew like crazy. A few years back I was thinking about why. So last summer I kept the old one in the greenhouse. It grew fantastically and no dieing off branches that I faced previous years.

So I came up with this experiment. 3 cuttings outdoors all summer and 3 in the greenhouse. When winter arived I put all of them in the unheated part of the greenhouse. Something I never dared before. The result was that the three outdoors ones all died and the three greenhouse ones all survived.

So my conclusion is that trees that have perfect conditions most of the year can take shorter periods off less perfect conditions while it is long periods of unfavorable conditions that kills slowly. That would also explain why many indoor kept chinese elms do not die until after 2-3 years. They just go weaker slowly.

The species you ask about is all said to be kept above 10c. I am sure there is a reason for that. But one night below that will not instantly kill them. I am not even sure that you will notice any difference. One thing that can help trees go thrue low temperatures better is to keep them on the drier side. Cold temperatures are not as bad as cold and wet. That is primarily why I keep most of my trees under roof in winter. Atlantic coastal climate with 670mm annual rainfall, most of it in october and november just before freezing.?

Now, I would like to ask what experience you have from previous years? Did you bring them back in or did you left them outdoors? How cold nights have they endured in your care?

On the past I have kept them indoors until I was fairly certain that temperatures were OK. One night at 49F/9C didn't bother me.

However, lately there is this climate change going on. One result is that temperature swings are much wider and more unpredictable. Two years ago we had nice warm weather, then after every single tree leafed out, the last week of April we had three nights below 22F/-5C, with days slightly above freezing. Completely unpredictable. For that I carried them all into the garage. That took over an hour and the pedometer showed 1800 steps. And, then carried them all back out. There was a similar event a month ago and I carried about half of them in.?

The problem with waiting until temperatures are sure is that the trees miss a lot of sun. The baobab every year has a few buds act like they want to turn into leaves, but they don't until the tree goes outside, then all of a sudden there are leaves all over. The ficus is about the same. So I want to get them out as soon as reasonable, but don't want to carry them back in. I just carried them in last week, then carried them back out after a couple of days. Now I have tonight's extreme.

My plan is to bring the two smaller ones in - that is the baobab and the lime. It will be below 45F for about two hours. I don't think that will be a proble for the other two. We'll see.

We sometimes joke that our area can experience all four seasons in one day. There are people here who see no problem turning on the air conditioner for a couple of hours and then turning on the heat at night, then air the next day. That drives me wild.?

I think a few hours at 6c is not a problem. But please report in a few weeks how it worked for you.