We all know most citrus plants do not like freezing temperatures. But what is the upper temperature limit for citrus?

Citrus can take temperatures in the 120F+ range and still survive, but at temperatures above 95F, most all tree growth stops. - Millet (978-)

Thanks. The highest temperature we've had here is about 35°C, which is 95°F. Shouldn't be a problem then...

Hi,

can we made a rating of citrus species from the most tolerant to less tolerant?

Thank you.

David

I would say otherwise on temp. We have constant temps in the 95+ range and I see growth flushes all year.

David, when we are talking about citrus growth temperature limits, we are talking about the average full day temperature, (24 hour temperature average,) not just the high temperature reached for the day. You can find verification of 95F being the upper limit for citrus growth, by reading the paragraph titled "Maximum Endurance Temperatures" on page 55 of "The Citrus Industry" volume 1 - Millet (986-)

Hi Millet,

I don't have this book !

I'm looking for information about maximum temperatures for my greenhouse!
I want to plant 3 citrus in my greenhouse. Is for exemple lemon tree more "hot hardy" than orange tree or citron tree?

Thank for your answer!

David

Switzerland

David, lemon trees comes from tropical and sub-tropical environments, that’s why lemons need warm, and sufficiently wet climates, with mild winters and not so wide ranges of temperature. For lemon trees, the best temperature to grow them is between 13° and 30° C. A temperature lower than 0° C damages the tree. Moreover, if the temperature is higher than 38° and there is no humidity during the fruit setting and ripening period (when the fruit starts to develop), the growth of the fruit can be damaged - Millet (974-).

Millet, what is the optimum humidity during the fruit setting?

In my greenhouse, I try to maintain it over 60%! Is it OK?

David