A fertilizer, or sometimes known as plant food to amateur gardeners is used to enhance the growth and health of your plants. Fertilizer can be made up of chemicals or naturally occurring matter and is available in liquid, granular, and water-soluble forms. You can also purchase compost from gardening centers with fertilizer already mixed in.
You should always try to use a plant fertilizer to optimize the growth of your plants, this is because some soils will not be able to provide the essential nutrients that they need to grow properly.