If you find poison ivy growing in your landscape, you should not try to weed it out by hand. It may cause a severe skin rash that itches for days and the plant will probably grow back from the roots anyway. This might be the time that it affects you. Use caution when applying a herbicide near green foliage of landscape plants or grass. The best time to apply a herbicide is during the spring or early summer when poison ivy is in full growth.
Some people have allergic reactions even to dead poison ivy plants.
Florida's sandy soils have nutrient problems that make growing ornamentals very difficult. It is very important to provide enough of the essential fertilizer materials. One required nutrient, manganese, is vital to the health and normal growth of many plants. Unfortunately, manganese is usually deficient in Florida soils. The soil pH is a factor in the availability of manganese.