Made from molten lava that's whipped like cotton candy, rockwool is chemically and biologically inert, making it the perfect media to grow your best crops free of external contamination or influence. These 1.5" square Mini-Blocks sit in a tray (flat) without support for easy starting of seeds and cuttings. They come individually wrapped in white plastic to retain moisture and minimize algae growth. At transplanting you can remove the wrapping and transplant into any loose media such as Growcubes or coconut fiber or leave wrapping on and set on top of a larger Gro-block. Packed in easy tear away strips, labeled with instructions.
MM 50/40 Pack of 24 1.5" starter cubes