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starting weed seeds in rockwool

A combination of basalt rock, fast spinning actions, and extremely high temperatures are used to make Rockwool. The process starts with a combination of basalt rock and slag recycled from the steel industry.

After seedlings have developed their first few sets of true leaves, they enter the vegetative phase. By this time, you’ll notice roots starting to protrude out of the Rockwool blocks. This means they’re ready for a bigger home!

Can Rockwool Be Composted?

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.

Give your plant one last prune before it enters the flowering stage. This will allow light to penetrate the canopy so each bud site can thrive.

Contents:

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.

3 days. Once the first true leaves emerge, we want to select for the strongest one (the one that grew the tallest), and cut off the tops of all other seeds that are growing next to it. Do not pluck them out, as you may uproot it’s neighbors. Simply cut it off as close to the hole as you can without messing with the stronger one that you plan on keeping alive.

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

Rockwool Cubes are designed to maintain the correct water to air ratio and squeezing them may damage their structure. Some of the marijuana forums advocate doing everything from squeezing them completely dry, all the way to flinging them around like paintbrushes in order to get excess water out. None of that is necessary, leave it as it is. It will stay moist for several days without needing to be watered this way as well.

Some people claim they use a diluted nutrient solution to water their Rockwool cubes with during germination. Do not do this, as my experience has always been negative. Note the picture below, where I did an experiment by adding a very diluted grow nutrient to the Rockwool cube on the far left. It died within an hour or two, and the others went on to live happy lives. In my opinion, they do not need nutrients until they get into your hydro system.

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.

you dont use a humidity dome for starting seeds and second rockwool cubes will not dry out. they retain allot of water, and with

you dont use a humidity dome for starting seeds and second rockwool cubes will not dry out. they retain allot of water, and with

Well-Known Member

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

from there go to paper towel all in dark on heating pad at about 80 degrees

I use the paper towel method 100 percent success rate for me, then once the little white tail pops out of the seed, then move the seeds to the 1 inch rock wool with the tail facing down in the hole then lightly put a little piece of rock wool over the hole that the seed is in.