Grodan 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 for rapid plant growth. Grodan comes in graduated sizes. Seedlings started in cubes are easily transferred to blocks and then onto slabs， if desired. Seedlings or cuttings started in the Grodan cubes can also be transplanted into more traditional planters and growing mediums. Grodan A-OK plugs are designed for seed and cutting propagation prior to "blocking on" into larger growing blocks. The V-shape design of the plug discourages tangling of roots between the plugs in the A-OK plug sheet.

• Includes: 49 Starter Plugs of Grodan 1.5" AOK Cubes + 5 THCity Stakes
• Ideal growing media for clones， seedlings， or cuttings
• Grodan plugs have a uniform density， firmness， and fibrous structure. This means that distribution of water， nutrients and pH-value is also uniform， which has a beneficial effect on germination results
• Very controllable， so growers are able to steer plant growth
• Usable in recirculating systems from first drain， reducing water and fertilizer usage
• Uniform growing substrate which results in consistent plant growth
• Lightweight， pathogen-free， disease-free， seed-free
• Excellent buffer and re-saturation capability