Water soluble. Recommended for citrus. Professional quality evergreen, tree, and hedge fertilizer with 2% iron for quick greening. This fast-acting water soluble plant food will start kicking out rich green growth in no time! Apply every 7-14 days during the growing season for awesome results. For acid loving plants such as cedar boxwood camelia, euonymus, hydrangea, fir, pine, juniper, yew, magnolia, azalea, holly, rhododendron, blueberries and black raspberries.