Plants need to be fertilized because most mediums will not be able to provide the essential plant nutrients required for optimum growth throughout the duration of the crop, as your plants grow they absorb nutrients and leave the soil (in these applications) less fertile. They are essential to hydroponic grows as tap water alone will not suffice to feed the plants.
In order to assure stable plant growth, blooming, fructification and overall health, make sure you give your plants the right amount of nutrients at the right time (following feed charts!). There are two main life stages for plants, each stage has different nutrient requirements.
Supplements or additives (boosters, root enhancers and controllers) are used along base plant nutrients to respond to specific needs of your plants.
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