Growing plants on Grodan blocks is child's play, the blocks fit together perfectly. The Grodan Single Block System (SBS) and the AO propagation blocks fit into all available culture blocks. Please always note the correct hole size for the culture blocks (27 or 40 mm). The culture blocks are then later placed either on mats, in other substrates or directly in the cultivation system (e.g. ebb and flow table or NFT system).
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