Grodan Rockwool Grow Cubes Sheets These are smaller sized cubes that are primarily designed for Propagation. Whether you are starting seeds or cuttings these cubes will work great. The AO 36/40 and AO 50/40 cubes come in a 10" x 20" sheet that fits perfectly into standard 11" x 21" propagation trays. The MM 40/40 cubes are individually wrapped and come in strips of 15 cubes.
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