What exactly is fertilizer? And, why do plants benefit from it?

Source: Fix.com

Fertilizer is simply a material added to soils or directly to plant tissues that contains nutrients essential to the growth and health of the plant (…) Fertilizers are inputs that farmers and gardeners can use to increase the amounts and balance the ratios of these essential chemical compounds.

Soil is not dirt. Soil is very much a living, breathing, organic system of nutrients and matter, which plants draw from to build themselves (…) Over years of use, soils become less nutritious. To mend this, we add inputs back into the soil. Often times, this is in the form of a fertilizer.

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