Abiotic plant disorders are nonbiological factors, usually associated with the plant's environment, that affect plants adversely. Important environmental factors include temperature, moisture, soil pH, air quality, light regime, and plant nutrition. If one or more of these factors goes above or below the optimum range for a given plant species, plant growth might be abnormal or adversely affected. Abiotic disorders may also be caused by human activities, such as pesticide and fertilizer applications.
The biggest problem affecting plants growing in south Florida this month is COLD temperature. There are a lot of tropical plants in south Florida that can be severely damaged or killed by cold weather. Sometimes it doesn't even matter how cold the temperature gets, but the change in temperature that can be damaging. This even applies to watering with cold temperature on a hot day. The surface of a leaf in full sun can get very hot, so when you irrigate with water that is much colder (i.e. 40 degrees), the rapid change in temperature can damage plant cells. Refer to the previous blog post (i.e. mesophyll cell collapse) for further information.
Links to additional information on cold damage:
Cold Protection on ornamental plants:
Cold protection tool kit:
Low temperature damage to turf:
Cold protection methods:
What to do after a freeze:
Photos of cold damage: