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Finally, the dense sheets enter a large oven. The heat activates the binding solution and enables the wool fibres to hold their shape.
Rockwool also poses a potential health hazard to growers. New Rockwool cubes can contain a lot of loose fibres and dust. These particles can end up in the air, and even on your skin and in your eyes, mouth, and lungs. Much like asbestos, tiny fibres can build up in the lungs over time if you work with new Rockwool cubes every day.
Is Rockwool Biodegradable?
These small particles are classed as “fine mineral fibres”, which the Environmental Protection Agency (EPA) in the United States has identified as probable human carcinogens  .
3. Put your clones into cubes: Use a skewer to create a sizeable hole in the top of each Rockwool cube. Inset the stem of your cutting into the hole, gently pushing it so it reaches the bottom half of the block.
Use the steps below to transplant into soil:
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Check out this method in action:
Best Way To Germinate Weed Seeds
About 2-3 weeks after germinating, you are ready to transplant these babies into the hydroponic system of your choice. A good rule of thumb to go by is that you want to transplant them once the first roots begin poking out of the Rockwool cube. Don’t wait too long though, as eventually the roots will begin tangling around the cube since it is their only source of water. You want to catch them right as they pop out, so that when you transfer them into your hydro system the roots will grow down into the system, and not just try to feed off the Rockwool cube alone.
We’ll explore each method in more detail below.
Step 4: Place your plates or container in a warm (70-80F / 21-26C) and dark environment