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 larger 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. Six 4"x4"x4" Gro-Blocks, each with pre-formed holes.

6 Grodan 4x4x4 in. Gro-Blocks w/holes.