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Known for its quality, consistency and ease of use, high-performance Grodan stonewool is used by hydroponics gardeners the world over. Seeds or cuttings are started in these Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can also be planted directly into containers for soil gardening. This is a strip of six 4"x4"x3" Gro-Blocks, without pre-formed holes. 6 blocks/sleeve
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