: Rockwool has a naturally high pH (around 8.0) that can lock out nutrients. You must soak the cubes in slightly acidic water (pH 5.5 to 6.5) for at least an hour before use.
: Handle rockwool carefully. The tiny fibers can irritate your skin, eyes, and lungs; wearing gloves and a mask is recommended during handling. Where to Buy Locally vs. Online How To Start Seeds In RockWool Cubes Indoors buy rockwool cubes home depot
: Even when fully saturated, rockwool maintains roughly 18% oxygen between its fibers, making it nearly impossible to overwater or "drown" your seedlings. : Rockwool has a naturally high pH (around 8
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