Springtime is here and now is the best time to fertilize your lawns, shrubs, and trees here in Phoenix Arizona. If you are using a liquid fertilizer, follow the directions on the amount to use per gallon of water. If you are using a granular fertilizer, water the fertilizer in thoroughly after spreading. The best practice for applying a granular fertilizer is to move any kind of ground cover aside prior to applying the fertilizer around the base to be fertilized. Ground cover can be mulch, gravel, or a weed barrier.