Seven minutes—packed with info! We take a look at Grodan A-OK starter plugs (stonewool cubes), Grodan Delta 3-inch and 4-inch rockwool blocks, Hugo 6-inch blocks, Big Mamma 8-inch blocks, Unislabs and loose fill rockwool growing media. We cover pre-soaking rockwool, adjusting pH, charging up with hydroponic nutrients, hardening off seedlings and cuttings, and transplanting into soil and soilless media such as coco coir.
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