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Stone wool block from the Grodan Improved range.
The Grodan Improved Gro-Block GRI22.5 Jumbo is a professional stone wool growing block measuring 150 x 150 x 100 mm, featuring a planting hole with a diameter of 40 mm and a depth of 40 mm. With its generous substrate volume of 2.25 litres, this large growing block provides extensive space for root development and precise root-zone management.
The Grodan Improved product line combines an optimised fibre structure with Advanced Wetting Agent technology. This enables uniform distribution of water and nutrients throughout the entire substrate volume. The homogeneous distribution of water content (WC) and electrical conductivity (EC) supports a stable root environment and efficient water and nutrient uptake.
The improved water distribution and substrate structure promote fast and consistent root development. Thanks to the larger root volume, plants can efficiently utilise the available growing medium while professional growers benefit from precise control over irrigation, water content and nutrient availability.
The GRI22.5 is particularly suitable for professional hydroponic cultivation and vegetative and generative crop steering strategies. Its planting hole accommodates 40 mm Grodan Mini-Blocks and other compatible propagation blocks. The growing block can be used individually or combined with suitable Grodan growing slabs.
