Do you use the same fertilizer for everything? Do you use different fertilizers for different types of plants, i.e., perennials, annuals, vegetables, shrubs, evergreens, trees, containers,etc.? I do not have room for a compost pile or container so I use an organic granular (Espoma) 5-3-3 and an organic granular for acid loving plants such as hydrangeas, azaleas, dogwoods and evergreens. I am sure there are some I am missing, but these are the varieties in my garden.
I do use super bloom liquid formulas in my containers which are produced by Peter's and Schultz's with a high middle number. When you have containers that are really putting out blooms, you need to pinch and cut back every once in awhile to keep them going until fall.
Carolyn Gail of Sweet Home and Garden Chicago had some very good advice in regard to fertilizer. Her first recommendation is to do a soil test. I must admit I am negligent in this area having purchased a kit many years ago that I believe is still in my garage. Carolyn also informed me that I can purchase some very good compost mixes, "Nature's Finest," and "Back to Nature," are two of the brands on the market.
I have heard from some bloggers regarding their favorites (many like the time-release products). Let me know if you have something that works well for you because we all seem to spend a lot of money and time on fertilizers.