Please do not be misled by some viewer's comment. We do not use household fiberglass insulation cut into squares. What we are using is genuine GroDan Rockwools which is one of the best growing media in the world for hydroponics. It is very absorbent and can hold water for quite a long period of time, making it a great material for seed and cutting sprouting in preparation to growing hydroponically. Each Rockwool cube has a predrilled planting hole make seeding and plant propagation a breeze! .
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