During the fist few years, apply fertilizer to young citrus trees to stimulate vigorous growth of leaves and branches that will become the framework of the mature tree. Beginning about 2 weeks after planting, frequent, light applications of fertilizer should be made approximately every 6 weeks. Avoid burning roots with high levels of soluble fertilizer applied all at once. The goal of the fertilizer program for young trees is to continue to stimulate vigorous growth of leaves and branches that can compete with early fruit production. After the tree has become established, the goal will be to replace nutrients that were removed from the soil by the fruit and to provide enough nutrients to sustain continued tree growth. Many different fertilizer formulations are available for use on citrus trees. In general, the numbers on a fertilizer bag refer to the percentage of nitrogen (N), phosphorus (P205) and potassium (K20). plus all the micronutrients. For example, if the numbers 8-8-8 were listed on the fertilizer bag, it would contain 8% nitrogen (N), 8% phosphorous (P205) and 8% potassium expressed as (K20). Fertilizer should not be applied between October 1 and February 1 in regions where cold damage can occur. This will reduce the possibility of untimely growth flushes in the winter. For young outdoor in ground trees do not use a fertilizer with higher than an 8-8-8 analysis during years 1 to 3. Good luck to you and your trees. - Millet