its not uncommon to start clones and seeds in the 1 inch rockwool cubes and then they can be transplanted into a larger cube like what you have with a 1 inch hole or place directly into a soil or other meduim.
but rockwool is a hydroponic meduim and does require complete nutrients if you entend to grow for very long in them.
bejay Reviewed by bejay on . Rockwool - How To? This is a pretty basic question (so beginners section is right then), but I've just bought 8 3x3x2.5 rockwool cubes for starting my plants. A couple of questions. .1. I only grow in soil, and will be for this grow to. With the hole in the rockwool being 1" is it ok to cover the hole in soil and then let it grow (this should be ok, but trying to confirm things). .2. These are pretty big cubes, and I intend to only grow my plants to about 14" mature. Will I need another pot to put them in, Rating: 5