Gro-Blocks Delta 4, Small 3″ w/o Holes
Whether starting your seeds and cuttings in A-OK Starters, Macroplugs, or Mini-Blocks it is a good idea to transplant into a 3” or 4” block. You know it’s time to transplant to the Gro-Block when roots coming out of the starter are about 1” long. Just place your Mini-Block on top of the 3” or 4” block without the hole, or your Macroplug/A-OK into the 3” or 4” block with the hole and watch your plant flourish.
Stonewool is recognized the world over as the ideal hydroponics growing substrate. Seeds or cuttings are started in theseGrodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can be planted directly into containers for soil gardening as well. This is a strip of eight 3″x3″ x2.5″ wrapped Gro-Blocks, without pre-formed holes. Grodan stonewool is known for its quality, consistency and performance.