Nutrient and mineral excesses
salts, and pesticides can be toxic to plants if present in excess amounts or if
applied incorrectly. Excess concentrations of one nutrient can reduce the
availability of other nutrients. Toxicity symptoms include leaf tip
dieback, marginal leaf chlorosis, necrosis (or burn), branch dieback, and pest
nutrient disorders by preventing root disease development, providing good
drainage, and using good practices during fertilization and irrigation. Make
sure that herbicides don`t drift over into your landscape plants.