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We all (mostly) know about cold weather and trees.

For tropical trees, what happens at 10C/50C that is bad for the tree? Currently weather here is highs 80sF/26C except once a week one or two nights around 40F/5C. Usually thus goes on for a month. I would like to move them out in the sun and rain. Should I wait until the expected lows never go down?

I think 5°C still a bit cold for tropicals, not because of the 5° itself, but because it can drop very easily and some other factors can lead to a late frost.

My Tropicals stay out all year, and 5°C is a common coldy night here on winter...
I just keep an eye for dropping to 0°C which occurs only a few times in our winter, then, I would cover a few more sensitive trees.

Albas wrote:

I think 5°C still a bit cold for tropicals, not because of the 5° itself, but because it can drop very easily and some other factors can lead to a late frost.

My Tropicals stay out all year, and 5°C is a common coldy night here on winter...
I just keep an eye for dropping to 0°C which occurs only a few times in our winter, then, I would cover a few more sensitive trees.

All the tropical tree guidelines say 50F/10C or even warmer 55F/13C. Ivan see that the tree would not grow much at colder temps, but I wonder what damage, if any, it would do to go outside when the temps are only going below 50/10 for a couple hours.

The species and the duration of the low temperature may make a difference as well. My scheflera was ok last winter in 5c. This winter was a lot longer at that temperature and they suffer towards the end. Some pure tropicals I have never tried under theese conditions died after a week. Ficus looks ugly in spring but always bounce back like crazy come spring.

I think a few hours in the nights at 5c will not harm any tropicals.

I don't think a few nights of 5°C would cause any damage, just keep an eye on the forecast and give it some extra attention if it's already with new shoots.

I know you can't keep moving them Ivann, but IF you expect a sudden temperature drop bellow zero after it's already out, and you're worried, you could just cover it with a piece of cloth for example

Tropical plants just means that the tree is from a tropical climate. The only thing that differs tropical climate from subtropical climate is that it never freezes. If it does it is a subtropical climate.

I grow plants from the highlands of South america which is considered tropical where the annual awerage temperature is 9-12 degrees and the lowest it gets is around 2 degrees. While in some parts of the tropics the yearly average can be more than 30 and the lovest at 20c. Death valley, the hottest part of the world is not tropic. They can get temperatures below freezing, not very common, but it can happens every few decades. Hence it is classified as subtropic.

So what do I want to say with that? The only thing that is totally certain is that tropicals cannot take frost. Other than that, one needs to look into the local climate where the plant comes from. Some can take more cold temperatures than others, some need more warmth during summer, some less. But it is not digital, there are some space for fluctuations outside the natural environment. The more you go outside the perfect environment the less vigour and health you get. But as long as you stay within an acceptable range the plant will survive.

Three days ago the forecast for next Sunday/Monday was two days with lows 45F and 46F. Yesterday the forecast was 48F and 49F. Today the forecast is 49F and 50F.

I moved the trees out into the sunshine. I watch the forecast closely this time of year because we do get hard freezes, and I may have to move everything into the garage, but next weeks chill is warming up.

Now with highs around 80F/25C I have to remember to water almost every day.