Grodan rockwool cubes are suitable for a wide range of plants. The cubes are arranged in sheets that make propagating and transplanting easy. The sheets fit nicely into a standard 10” x 20” flat. This is a clean product, no pollutants or harmful bacteria. It does not lock up or release any substances, ensuring all water and nutrients are available to the plant. It is easy to control and steer the growth of the crop to achieve higher yields than seen in soil-bound cultivation. Stone wool can be recycled (eg composting). These cubes are designed to work with VH Hydroponics’ systems.