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Grodan Hugo rockwool Gro-Block, 6"x6"x5.8", with hole 40/40
- Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs
- -Grodan Delta blocks are the most uniform blocks available on the market
- These growing blocks are used for direct sowing or "blocking on" of Macro and Multiblock raised plants
- Hugo is the largest of the growing blocks. It provides enough growing volume to support a larger plant, so it does not need to be placed on top of a slab
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