Rockwool is a growing medium used in hydroponics. I use it (even though I don't grow hydroponically) because it works great for germinating seeds. I use rockwool for tomatoes and Oasis Grow Cubes for peppers. In the picture at the top of my recent sprouts, you'll see a whole slab of rockwool cubes. I just break apart or cut apart the cubes when I'm ready to plant them in soil (I use coco coir). Another reason I use rockwool is because I sell hundreds of plant starts to a local plant shop that has a large number of hydroponics customers.
I keep the tray filled with water. The cubes remain moist, which aids in the germination and subsequent growth. I did an experiment of different pre-soak methods, with no pre-soaking as the control, and found it unnecessary to pre-soak my seeds when using either rockwool or oasis grow cubes.
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