Hydroculture systems utilize rock wool instead of soil which principally preserves wetness to a greater extent and is free of any infection. Other than that, roots can hold on to it so it can bear the weight of the plant. Air permeability is also important in order to avoid the suffocation of the plants.
Due to the fact that the growing medium does not contain nutrients compared to soil, it is crucial to be impregnated with the adequate nutrient solution. If we only wet the plants using tap water, they would die without the nutrients required. The frequency of the wetting of the growing medium is determined by the given plant’s nutrient and water need.
Other than the rock wool, clay granule is also a qualified growing medium. We decided to use these two in our systems for the highest yields.