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how to start marijuana seeds in rockwool

How to start marijuana seeds in rockwool

i would have soaked mine over night first 75 percent of time is split the next day

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

germinate them what ever method you prefer to use,

Well-Known Member

I don’t know where the paper towel method started, I only know that it has been around far too long. I first learned of it over 30 years ago. It’s hogwash. does it work? Most of the time, but why risk handling a delicate seed and it’s new born tap root when you can simply place the seed in any moist medium and have it germinate? If the seed germinates in a paper towel, which surely can’t sustain the seed, won’t it surely germinate in moist rockwool?

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

Well-Known Member

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

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

How to start 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.

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.

CFL lighting

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

Several companies make special nutrients specifically for germinating seeds, but most hydro nutes mixed at a light dose will work fine. Including a rooting stimulator is ideal to help grow out a strong root system as quickly as possible.

Algae on rockwool cubes

This method is great if you have a lot of female seeds, but for the average cannabis grower it is a bit wasteful. Particularly since if you’re using regular non-feminized seeds you’ll likely get 50% males, so you’ll want to grow each out individually so you can maximize the resulting female plants.

How to start marijuana seeds in rockwool

When formulating this plan I was a little hesitant as I hadn’t seen that many people using this process. Most people if they use rockwool stay with rockwool in a hydroponic indoor growth setup. I didn’t find many people who took the rockwool cube and transferred it to soil after it sprouted and wasn’t sure if this would work.

Preparing Rockwool Cubes for Germination

Another method is to use 3″ rockwool cubes to start seedlings in, then put 20 of them in a litter pan, cover it with another pan, and transport this to the grow site. The cubes can be planted directly into soil.

Bringing Down the pH

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