Stonewool is recognized the world over as an ideal hydroponics growing
medium. 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 be planted directly into containers for soil
gardening as well. This is a strip of eight 3"x3"x4" Gro-Blocks, each
with pre-formed holes. Grodan stonewool is known for its quality,
consistency and performance.