Pargro is the leader among affordable horticultural rockwool. Made right in the Grodan factory, you can be assured of a high quality product at a great price. Drainage Driest value-priced rockwool on the market 14% drier than competitor blocks Value Value priced - no frills saves you money Half case sizes in plain boxes Quality Cheap in price by not in strength and uniformity Made under quality control at Grodan factories.