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growing cannabis seeds in rockwool

Growing cannabis seeds in rockwool

germinate them what ever method you prefer to use,

Well-Known Member

i have a Hydro set up also so i have been starting seedlings in rockwool for years.

Well-Known Member

seedlings in them you would not have to water for about a week maybe longer.

Growing cannabis seeds in rockwool

Once your seed germinates you’ll see two small leaver poke up out of the whole. These two leaves, called cotyledon leavers, are quickly followed by additional leaves that have the classic shape associated with cannabis plants. As the seedling grows taller the roots will continue to grow well. Eventually you’ll see white roots start to poke out of the sides.

You may also notice dark green forming on your cubes – in that case you have algae. The moisture rockwool holds provides a nice environment for it, but algae on rockwool cubes isn’t a huge deal. You can prevent algae on rockwool by covering the surface to block light from hitting the cube, without light the algae cannot live.

What type of lighting should be used for starting seeds in rockwool?

Consider using a hydroponic rockwool system to avoid your rockwool cubes drying out too quickly.

My weed seeds rooted in rockwool – what next?

Watch your leaves for nute burn which can be seen when the tips yellow. If the whole plant is a very light green or it starts to yellow then up the nutrient mix accordingly.