It is important to understand that warm winter temperatures, not irrigation or fertilization, play the major role in stimulating untimely winter flushes of large, mature trees. However, when unseasonably warm temperatures occur, young trees may flush more easier than larger mature trees, especially trees planted the previous fall. If such young trees flush during winter months, fertilization may stimulate additional, tender growth, making trees even more susceptible. Consider the degree of flush, tree size, time of year, and geographic location when making this decision. (Florida Your Dooryard Citrus Guide).