What kind of fertilizer should I use?

Both chemical and organic fertilizers supply nutrients for plant growth. Most are added to the water or soil, but some fertilizers are sprayed on the foliage. The best fertilizer to use depends on many factors, such as the plant's growth stage, the soil structure and chemistry, and the method of applying the fertilizer. Applying fertilizers according to soil test results greatly increases fertilizer effectiveness and may reduce fertilizer costs.