Advanced Nutrients - Rhino Skin
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That element is silica, which is the second most abundant element in the earth’s crust (oxygen is the most prevalent), but guess what? Silica is missing from hydroponics root zones and fertilizers.
This is a cause of concern because your plants desperately need silica. They evolved to intake it so it becomes part of their cell walls.
That’s important because cells are the building blocks of your plants and cell walls are the structural features that determine the strength of your plants’ stems, leaves, flowers, floral structures, and metabolism.