Florida is famous for its oranges. Sweet and juicy, this fruit grows very well in Florida's subtropical climate and provides the world with gallons of nutritious juice and other products. You can grow the same type of oranges professional Florida farmers grow if you live in USDA climate zone 8 or higher. If you live in a colder region, you can grow Florida oranges in large containers that you keep outdoors in the summer and indoors in the winter. Fertilizing Florida orange trees correctly will yield healthy trees with a maximum harvest.
Fertilize your orange trees approximately three times during the warm months of the year with a special plant food designed for citrus. Oranges need plenty of nitrogen to keep their leaves green and healthy, so look for a fertilizer with an N-P-K ratio of 20-10-10 or 16-8-8. You can choose either liquid or granular plant food.
Water your orange tree before you apply fertilizer.
Apply your first application of fertilizer in spring, when your tree begins to show signs of vigorous new growth. Prepare your fertilizer according to package instructions. Repeat this application every six weeks until late summer---do not fertilize later in the year. If you are growing your orange tree in a climate where winter temperatures drop below freezing, fertilize your tree in late spring and not again later in the season. Fertilize container plants twice each month.
Apply either liquid or granular fertilizer around the tree's drip line, avoiding contact with the trunk. Larger trees' drip lines can be eight feet from the trunk, while that of smaller trees will be closer to the trunk. A good rule is to apply your fertilizer underneath the outermost branches.
Spray trees that have yellowing leaves with a fertilizer containing iron and zinc. Spring and summer are the best times of year to apply this type of foliar fertilizer.