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Grodan is a Dutch company with offices in Poland and the United States which focuses on plant and vegetable cultivation. The company attaches great importance to sustainability. Most of its products are stone wool substrates. The product lines are divided into the "Vegetable growing", "Flower growing" and "Plant propagation" categories. However, the focus is placed on the growing of vegetables and a variety of substrates are available for this purpose. Some of the noteworthy products in terms of plant cultivation are Grodan’s stone wool blocks which are optimized for the cultivation of crops. Another notable product is the Grodan cuttings tray which is well suited for the propagation of plants from seeds and which is provided along with stone wool blocks. Grodan also offers many accessories, including measuring instruments for determining the electrical conductivity or the water content.