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marijuana seed germination rockwool

Finally, the dense sheets enter a large oven. The heat activates the binding solution and enables the wool fibres to hold their shape.


Is Rockwool Biodegradable?

The Danish founders of Rockwool obtained a licence in 1935 to produce stone wool in Scandinavia, Germany, and New Jersey. Over almost a century, the Rockwool company has continually refined their manufacturing process to create a more efficient and effective product.

Rockwool harnesses the power of natural stone to produce a fluffy and aerated growing medium ideal for cannabis growing. This material drains well, supports root development, and arrives in a cuboid shape that is easy to transplant into hydroponic or soil-based systems.

Sometimes seeds struggle to become established when sown in compact and hard soils. However, they establish themselves quickly and easily within Rockwool cubes. The young roots easily pass through the gaps between the fibres.

Get a bowl or some other container that is big enough to fill with water and have room left for your Rockwool cubes. Your average salad bowl will work fine for 3 Rockwool cubes, if you are planning on doing more than you will need a larger container.

In this lesson, we will learn how to start your own seed with Rockwool Cubes. Below is a detailed guide to success with Rockwool, and a step-by-step video tutorial can be found at the bottom of the page.

Important: Do not let the PH of the water go below 5. A Ph this low will damage the fibers of the Rockwool Cube

Items you will need:

Rockwool Cubes have a PH of roughly 7.8. This is pretty alkaline, yet our plants prefer to grow in a slightly more acidic environment (between 5.5 – 6.5). In order to prepare our Rockwell cubes for the seeds, we need to soak them in some PH adjusted water, that way they have everything the seeds need to germinate and sprout; water and a slightly acidic environment.

On top of that, Rockwool is like asbestos, you don’t want to be squeezing it or breathing it or generally touching it any more than you need to. Here is a good article on some of the health concerns of Rockwool. I use it because it is what works best, but be cognizant to the fact that it is a potentially dangerous substance to be making contact with so don’t do anything more than you need to with it.

But the best way to germinate weed seeds would really be a combination of these methods.

After examining each method, if you absolutely had to pick one, it would be starter cubes and seedling plugs.

We’ll explore each method in more detail below.

Why Plugs?

Germinating with starter plugs or cubes is easy and the most reliable method on this list.

So what is the best way to germinate weed seeds? Read on to find out…

To accomplish this, use either Ph down chemicals, or lime juice (as it’s acidic). Add these to the water in small increments (VERY SMALL), and test the water to see where the Ph is. Continue doing this until you have a Ph of 5.5-6.

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