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Is rapid rooting and fast initiation of vegetative growth important to your crop? Do you need a slab that remains firm throughout the season? And do you desire excellent irrigation control for your crop? If so, then the Grodan Expert rockwool slab is the ideal substrate for your needs. This single season slab has a vertical fibrous structure, resulting in a firm slab. The Expert offers excellent water control for the crop. In addition, it has proved to be an excellent substrate for trouble free cultivation. As a result of all these benefits, in combination with its favourable price, it is understandable that the high quality Expert slab has been extremely popular with growers for many years.