Seeds or cuttings are started in these Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab

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 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.