Pargro is the most economical quality horticultural stone wool on the market. Pargro Quick Drain™ Gro-Blocks are perfect for fast-growing plants which require regular, aggressive feeding thanks to its amazing ability to drain quickly between irrigations. Enjoy stone wool productivity of premium stone wool with the best value product available. Pargro is known for value, quality, cleanliness and consistency, crop after crop. From plugs and Gro-Blocks through to slabs, Pargro has you covered from propagation to harvest.