This nutrient supports the growth of every plant cell, aids in energy transfer and photosynthesis, and plays an especially important role during the flowering phase. As a bonus, basalt rock dust also helps to absorb large quantities of carbon dioxide from the atmosphere.
Tossed whole onto a compost pile, Rockwool will take an extremely long time to break down—hence why many growers see it as bad for the environment. You should aim to shred up your used cubes as finely as possible to accelerate this process.
Is Rockwool Biodegradable?
2. Nourish your cutting: Dip the cut tip of your clone into rooting gel to expose it to rooting hormones, nutrients, and trace elements.
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.
Rockwool cubes are naturally alkaline. Because cannabis plants prefer slightly acidic soil, growers have to stabilise the pH of their cubes before sowing seeds (you’ll find out how to do this below).
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.
Using either a PH test kit or a Ph meter, determine the Ph of the water. Water comes out pretty alkaline, usually around 7.4, so you will need to acidify it a little bit to bring that Ph down to the desired level. Aim for as close to a Ph of 5.5-6 as you can get.
Important: Do not let the PH of the water go below 5. A Ph this low will damage the fibers of the Rockwool Cube
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.
Here is what it should look like:
They should look like this:
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
germinate in paper towl folded up, leave a littel pocket, and moisten the paper towe, and keep moist. leave it in a tupperware contaier in the dark for 3-7 days, keeping the towel moist, and you should see the embryo.
another ethod that ive HEARD works is just to put in a shotglass over night, see what happens ins the seed absorbs the moisture until it pops. thats what ya want..
Whitewidow x Euforia x "Mindfuck".
Ghost of Ghana 100% equatorial sativa. (special).
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seedlings in them you would not have to water for about a week maybe longer.
get 2 paper towels
fold them in half together
place the seeds in-between the folded area
dampen the paper towel (damp, not dripping, but not too dry either)
place the damp paper towel with seeds in a ziploc bag
put them somewhere dark for a couple days
i have a Hydro set up also so i have been starting seedlings in rockwool for years.