Supercooling of tropical plants
Supercooling affects the majority of tropical plants at temperatures below +5 C, and for some - even +12 C, depending on their tolerance to cold conditions. At that the duration of the cold period is vital. The longer is influence of frost, the more dangerous consequences to the plant. Drafts, in particular, are the most insidious, even if the temperature of a current is not too very low.
Symptoms: leaves affected by drafts dry, frequently in fragments; the growing point dries up and falls off. Contact of a plant with a frosty glass leads to frostbite - leaves almost instantly blacken and die off.
The help: put a plant in a warm and well lighted place, but in the distance from direct sources of heat (a battery, or a heater) to not dry up finally the damaged leaves. Spray a plant frequently; you may even cover it with a package. Watering should be reduced till appearance of new shoots.
In couple of weeks the plant “will believe”, at last, that the bad weather is over, and can start to produce new shoots.