Rockwool trays for saplings and clones.Best Rockwool for Growing CannabisĬheck out our catalogue for varying options: There are various different recycling systems designed to turn old slabs and rockwool cubes into brand new slabs. Rockwool isn’t biodegradable, although it can be recycled. Plus, any organic residues begin to decompose and this type of substrate doesn’t contain any microorganisms capable of decomposing them properly this can attract pathogens and fungi. We don’t recommend using the same rockwool again as it can produce pH related issues. In order to check if the pH has changed, water using 5.5 pH water and check if the water that drains out of the bottom is of a similar pH level. The water you submerge your nutrients in should be between 4.5 and 5, and the EC should be at about 0.5 to 0.6. In order to reduce the pH levels to 5.5 you’ll need to submerge your rockwool in water with nutrients for a day. You’ll need to lower this before you start growing hydroponically.Ĭannabis plants grown hydroponically require a pH of: When it comes to growing cannabis with rockwool, your plants’ only source of nutrition is what you give them when watering, so you’ll need to use a soft yet constant feeding schedule. Most big brands have a range of specific nutrients designed for hydroponic growing such as Nutri Forte A and B, Tripart Grow, Micro and Bloom, or B’Cuzz Hydro Nutrition A and B. The perfect fertilizer for this type of substrate is generally mineral fertilizers, as they’re absorbed rapidly.
One of the downsides, however, is that you can’t grow 100% organically using this method, you’ll only be able to use a few organically-sourced additives. Rockwool is the ideal substrate for hydroponic cannabis growing thanks to its characteristics it’s inert, porous, doesn’t degrade, insulating and it holds the roots in place. If you grow using this substrate, you’ll need to use nutrients every time you water this strain. It’s an inert substrate, which doesn’t contain nutrients or microbial life. Rockwool is a type of mineral wool made using volcanic rock.
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