I understand from a physiological standpoint why some plants can not survive freezing temperatures and will die when their cells freeze- but what about ultra tropical plants that die when the temperatures fall below 55f (or so depending on the plant) - or at other temps well above freezing? why would such a plant die at say 50f -55f? Obviously they do not die because the water in the cells freeze -- so what is the mechinism / why do some plants die if the temps fell below 50f ?
Some passion flower varieties are hardy to below freezing, some to freezing - and yet others die if the temperatures fall below 55f --- I would like to know the physiology of the different varieties - especially why some die below 50f.
If we only knew what the future holds - I graduated from college with a degree in science - yet never took plant biology or any plant classes --- who knew then I would now be raising plants for a living? (certainly not me!)