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Stone wool block from the Grodan Improved range.
The Grodan Improved Gro-Block GRI57 is a professional stone wool growing block measuring 200 x 200 x 142 mm, supplied without a pre-cut planting hole. With a substrate volume of approximately 5.68 litres, this large growing block provides generous space for root development and precise root-zone management in professional hydroponic cultivation.
The Grodan Improved product line combines an optimised fibre structure with Advanced Wetting Agent technology. This technology promotes uniform distribution of water and nutrients throughout the full height of the block, allowing precise management of water content (WC) and electrical conductivity (EC).
Improved water distribution and substrate structure support rapid and consistent root development. Plants can efficiently utilise the available substrate volume, while growers benefit from greater control over irrigation, moisture levels and nutrient availability.
Thanks to its large substrate volume, the GRI57 is particularly suitable for professional single-plant growing systems and drip irrigation. Uniform water distribution enables targeted vegetative and generative crop steering strategies.
The version without a pre-cut planting hole offers additional flexibility in choosing the planting position and creating a suitable opening for the preferred propagation block.
