Pine trees are relatively hardy and require very little care or fertilization. However, they can benefit from a complete fertilizer containing nitrogen, phosphorous and potassium.
Because pine tree root structures are shallow, fertilization can help maintain a strong base for the tree. Most experts recommend a soil analysis test in order to determine what nutrients are most needed in the soil around the trees. However, the fertilizer best for pine trees has a higher ratio of nitrogen to phosphorous and potassium. Some organic options also contain the relevant nutrients. Manure from cows, horses, poultry or bats has proper nitrogen levels for pine trees. Finally, compost made from decayed plant matter can help to maintain the health of the pine tree, provided that the compost is aged.