Grodan rockwool has been made in Denmark since 1969. Let us introduce you to Grodan stonewool: Grodan is water absorbent stonewool. Mother Nature makes her own stonewool which is known as angel hair from volcanoes. In the case of Grodan rockwool, rocks are heated up to 3000 degrees Fahrenheit and spun into wool like cotton candy. This method gives a media that is sterile and always maintains its structure as in the case of Grodan rockwool.
Grodan rockwool is made from molten rock spun into cotton candy-like fibers and then compressed in to cubes, blocks, or slabs. These convient cubes are recommended for starting seedlings and cuttings. They fit into common propagation trays and may be transferred as needed to blocks or traditional planters.
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