Grodan A-OK 36/40 6/15 Starter Cubes, 1.5" x 1.5", 30 sheets of 98 biological fertilizer covers a 2 ft x

covers a 2 ft x 4 ft veg footprint and eliminates the need to ever change a bulb again

You need to add nutrients when you first water the substrate (use your nutrient supplier's recommendations)

allowing more even distribution of moisture throughout the slab

Heavy duty zippers

Blend promotes stronger & bigger root systems

Grodan A-OK 36/40 6/15 Starter Cubes, 1.5" x 1.5", 30 sheets of 98 biological fertilizer covers a 2 ft xGrodan Stonewool (rockwool) is made from molten rock spun into cotton candy like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making different types of fibers. The purpose is to support the requirement of the plant in the different plant stages. Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen