Fertilizing gives orange and lemon trees proper nutrition needed for growth. Orange and lemon trees need a balanced fertilizer containing nitrogen (n), phosphorus (p), and potassium (k) to grow properly in Southern Florida. In the summer and spring, the fertilizer should be 25n-15p-15k; the bag will read 25-15-15. In winter, they need equal portions of nitrogen, phosphorus and potassium; the bag will have 20-20-20 written on it. Both of these fertilizers include low levels of boron for development of leaves, calcium and nitrogen for plant growth, copper for dieback, and iron for leaf development. The fertilizers also contain magnesium, manganese and molybdenum for proper leaf health and to prevent yellowing. Phosphorus is added to fertilizer to control brown spots on leaves, potassium is for fruit development, sulfur is for fruit color, and zinc is for prevention of premature leaf dropping.
Remove mulch and debris from around the orange or lemon tree.
Put on disposable gloves to avoid fertilizer coming in contact with the skin.
Read directions on bag of fertilizer, along with all warnings and precautions.
Prepare fertilizer according to the directions on the bag, using the measuring cup for proper measurements.
Apply fertilizer around the orange or lemon plant as per directions on the bag. Do not put fertilizer at the base of the trunk to avoid burning the plant.
Water lightly to prevent fertilizer from spreading to other trees as this type of fertilizer is not good for other types of trees.
Store leftover fertilizer in a cool, dry and safe place away from children and animals. Dispose of gloves and cup in a plastic bag.