How to Use Rockwool
by, 12-01-2011 at 11:27 AM (1672 Views)
Here's what I do with rockwool...Starting with 1.5" cubes, I remove the plastic wrapper.1. Soak for 15 minutes in properly pH'd water (I use 6.0)2. Squeeze the cube enough to get a fair amount of the water out, but don't wreck the shape (squeezed the hell out of the first one I ever picked up and it was so wrecked it was funny. Had to toss it and grab another).3. I never use the preset hole. Not sure what it was meant for, but it doesn't fit my seeds or my clones.4. Flip the cube over so that the preformed hole is on the bottom.5. For seeds, take a toothpick and make a hole about 1/2" deep. (I keep a marked toothpick in my tool case)6. For clones, make the hole about 2/3 of the way through the cube7. Carefully place the seed (pointy side down) into the hole you created. It should be a tight fit.8. Pinch a tiny piece of rockwool off one corner, flatten it and place it gently over the seed hole like a sunroof.9. Don't touch it again until you see leaves.10. Place the cube(s) on a plate or saucer and put under lights 24/7 till they pop through. Never had a failure.Once the plant breaks through, I leave it right where it is till the second set of full leaves. Then I transplant into my medium (I use either hydroton for DWC or soil), rockwool cube and all. I let the plants get a little leggy at first then submerge that extra height into the soil or hydroton so that the rockwool is fully covered.