The Grodan group was formed in 1979 with one goal in mind; developing the very best in stone wool substrate for professional horticulturists. Ever since their stone wool or 'Rockwool' has been considered among the finest growing media available. Designed and focused on using the smallest amount of input to generate the largest amount of output from your plants. We offer a wide range of Grodan products including starter plugs, grow block and slabs. If you are looking to grow with precision, Grodan has you covered.