you mean on my clones? i have these plugs called rapid rooters, they are littlle brown plugs, not the same consistancy as rockwool. The plugs fit perfectly into the big rockwool cubes like you saw in my pics. I get two big two gallon water jugs, clear, I cut them in almost in half about half waydown. I put a little tray in the bottom of this with six clones in it. then I close the water jug and tape it where I had cut it, It looks like a two gallon water jug with six clones in a tray at the bottom of the bottle. I poke holes in the screw on cap about six. Then I leave these under a couple cfls. I have NEVER lost a clone, not once. The big water bottles act like little green houses. Within three to four days I have roots.