: Never squeeze your cubes when wet. This crushes the delicate internal structure, reducing the oxygen-holding capacity and hindering root growth.
: Even when fully saturated, rockwool maintains roughly 18% oxygen between its fibers, making it nearly impossible to overwater or "drown" your seedlings. buy rockwool cubes home depot
: 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. : Never squeeze your cubes when wet