The shape and firmness of the cubes are of a quality that makes processing significantly easier, whether that processing is mechanical or manual. Every plug has a uniform density, firmness and fibrous structure. This means that distribution of water, nutrients and pH-value is also uniform, which has a beneficial effect on germination results.
The fibrous structure, predominantly vertical, gives the cubes the desired resilience. One practical advantage when pricking out is that the plug retains its shape, makes good contact with the block and guarantees fast root growth. A good balance between small and large pores in the stone wool ensures an ideal air to water ratio in the cubes.
The fibrous structure creates a balanced distribution of feedwater throughout the entire cube. In short, the homogeneity, flexibility, shape and firmness of Grodan cubes create the foundation for the optimum germination process and a uniform sowing result. Great for starting seeds and rooting of cuttings prior to plugging into the larger Gro-Blocks.