Viewing post #508695 by Leftwood

RickCorey said:My guess is that the upper "stress threshold" is particulalry dependent upon water availability to the plant, humidity, wind, clouds, and degree of shade or exposure.

Guessing even further, maybe a better statistic for tracking plant's stress level due to high temperatures would be "degree hours" or 'degree minutes" - the total number of hours or minutes when the average temperature for that minute exceeded the threshold.

Yet another guess: the temperature that stresses the plant would vary, depending on the age of the plant and perhaps the size of the root system relative to the foliage..

The validity, suppositions and assumptions of these are really fodder for a separate thread, don't at all answer Rosebush1's question, and steers the discussion away form its intended course. Maybe start a new topic in a different forum. I think we should really try hard to respect Dave's wishes, as he articulates in big green lettering above every Reply message box in this Questions Forum.