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planting marijuana seeds in rockwool

Planting marijuana seeds in rockwool

germinate them them move them to the rock wool cubes

Well-Known Member

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

Fuzzbutter

Also, rock wool is naturally alkaline, so you’ll need to soak it in PH balanced water over night first before putting ANYTHING in it. My plants are currently in rock wool and doing great

Planting marijuana 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.

Growing weed seeds in rockwool cubes is an easy way to start your cannabis plants. The techniques for how to start seeds in rockwool are the same for cannabis seeds as they are for other types of seeds.

CFL lighting

Avoid high-powered HID lighting such as 600-1000W Metal Halide (MH) or High Pressure Sodium (HPS) lights, they are far too intense for young seedlings.

You can also use LEDs to grow seeds. Usually the cheapest LEDs you find on Amazon aren’t great for flowering plants due to low light intensity and lower quality diodes. But these lower cost lights are perfect for delicate seedlings.

Can rockwool be reused?

Canna Rhizotonic is a rooting stimulator for cannabis plants that improves root development in cannabis seeds and clones.

Planting marijuana seeds in rockwool

Here’s a video of me inserting one seed into a cube:

I placed the cubes into the seedling starter tray and then inserted each seed about a quarter of an inch into the 1.5 inch cube. The seeds are really tiny so to help I used tweezers to place them inside the cubes.

With the seeds now inserted I placed the humidity dome / lid onto my starter tray (came with the set I bought). The reason for the lid is it helps keep the humidity high which assists with the germination process.

Inserting the Cannabis Seeds

You need to make sure the pH of the water you used is in the correct range, 5.5 – 6.8. Depending on your pH meter it could be off as well if not properly calibrated or if you are using a cheaper pH meter. In these cases try removing the seed and re-soaking the rockwool cube in another batch of pH-adjusted water

That was good enough (I’m so trusting about stuff I read online) for me so I decided to proceed.

There are many numerous methods germinating seeds. Popular methods include using paper towels, solo cups or just directly inserting seeds into soil.

Insert the Seeds and Store

My plan for growing the marijuana plant using rockwool was as follows:

Now that the cubes were properly prepared it was time to insert the marijuana seeds and store them in an ideal sprouting environment.