Rockwool Grow Cubes. Large Bag
Rockwool Grow Cubes. Large Bag at HorticultureSource.com -
Rockwool Grow Cubes by Grodan. Large Bag. Small air pockets form spaces for roots to take in oxygen but still be moist. Good stuff. Large bag will fill 23 one-gallon containers. Cubes are approximately 3/8" by 3/8" square.