What is Fertilizer and why do plants need it?
The following is adapted from www.howstuffworks.com.
In order for a plant to grow and thrive, it needs a number of different chemical elements. The most important are:
* Carbon, hydrogen and oxygen - Available from air and water and therefore in plentiful supply
* Nitrogen, phosphorus, potassium (a.k.a. potash) - The three macronutrients and the three elements you find in most packaged fertilizers
* Sulfur, calcium, and magnesium - Secondary nutrients
* Boron, cobalt, copper, iron, manganese, molybdenum and zinc - Micronutrients

The most important of these (the ones that are needed in the largest quantity by a plant) are nitrogen, phosphorus and potassium. Without nitrogen, phosphorus and potassium, the plant simply cannot grow.If any of the macronutrients are missing or hard to obtain from the soil, this will limit the growth rate for the plant. In nature, the nitrogen, phosphorous and potassium often come from the decay of plants that have died. In the case of nitrogen, the recycling of nitrogen from dead to living plants is often the only source of nitrogen in the soil.

To make plants grow faster, what you need to do is supply the elements that the plants need in readily available forms. That is the goal of fertilizer. Most fertilizers supply just nitrogen, phosphorus and potassium because the other chemicals are needed in much lower quantities and are generally available in most soils.

The numbers on a bag of fertilizer tell you the percentages of available nitrogen, phosphorus and potassium found in the bag. So 12-8-10 fertilizer has 12-percent nitrogen, 8-percent phosphorous and 10-percent potassium. In a 100-pound bag, therefore, 12 pounds is nitrogen, 8 pounds is phosphorous and 10 pounds is potassium. The other 70 pounds is known as ballast and has no value to the plants.

Be sure to visit Satellite Garden Centre and one of our associates will assist you in finding the fertilizer you need for your plants, garden or lawn.