The rate and frequency of application depends on the nutrient analysis of the fertilizer, plant species, soil type, and other factors. For outdoor or garden plants always start with a soil test to determine the amounts of fertilizer needed. There are some general guidelines on how often to fertilize plants.

Yes, over-fertilization can burn plant leaves or stunt growth. More is rarely better when using fertilizers. Always read and follow label recommendations for fertilizer rates, dilutions, and application guidelines. If you are ever in doubt, always err on the conservative side or use less fertilizer.

First you must figure out why the plant is not doing well. Ask yourself the following questions before pulling out the fertilizer bag: “Has it been over-watered or under-watered? Is it receiving enough light or too little light? Are there signs of disease or other pests?” Fertilizer doesn’t fix all problems, and in some situations it can make the problem worse.

Fertilizers, like many other household chemicals, should be kept out of the reach of children and pets. Hopefully these questions and answers will help you make good decisions on using fertilizers in your garden or landscape this year.

The numbers indicate the amounts or percentages of nitrogen, phosphate and potash in the fertilizer. These three nutrients are needed in relatively large quantities by most plants. The first number refers to the amount of nitrogen, the second refers to the amount of phosphate, and the third refers to the amount of potash. For example, a 10-6-4 contains 10 percent nitrogen, 6 percent phosphate and 4 percent potash.

The requirement of nutrients such as Nitrogen, Phosphate and Potash are soil and crop specific. The use of right ratio of nutrients as per soil or crop requirement is known as "balanced fertilization"