Hydroponics gardening guide – growing mediums used in hydroponics – HOW TO USE ROCKWOOL
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The urban gardener asked: The most widely-spread growing medium is, perhaps, rockwool. Originally used for insulation purposes and also known as mineral insulation, rockwool was first used as growing medium by Dane gardeners. Now, it is frequently used for drip-style indoor gardens around the globe.Rockwool is produced by a process similar to making cotton candy: [...]








