Hydrofarm Delta 10G Rockwool Block 4x4x4 6 Blocks Per Strip

Used for direct sowing or "blocking on" of Macro and Multiblock raised plants. AO 36/40 plugs fit well into the hole sizes provided by the blocks. The blocks can then be placed on top of a slab to provide for a larger growing volume. Features grooves at the base to promote better drainage. They are available in a large assortment of sizes and configurations to suit all types of plants.
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