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. This is a strip of six 4"x4"x3" Gro-Blocks, each with
pre-formed holes.