4. Now your blocks have the correct pH, are loaded with nutrients, and harbour beneficial bacteria and fungi that will fuse to the roots and help them thrive later on in the growing cycle.
Rockwool cubes are sterile and inorganic. After being exposed to extreme heat, Rockwool arrives at a grower’s doorstep clean and ready for use. Because it doesn’t contain any organic matter, Rockwool helps to protect the root zone against damaging microbes.
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.
Here are some final tips to reference so you can master using Rockwool to grow cannabis.
If you’re growing in soil, you can transplant the Rockwool cubes directly into your new growing medium. Soil growers have a variety of choices when it comes to what to do next. You can transplant into plastic or fabric pots, place your plants into greenhouses or polytunnels, or plant them directly into garden beds.
2. Nourish your cutting: Dip the cut tip of your clone into rooting gel to expose it to rooting hormones, nutrients, and trace elements.
Upon mimicking a volcano, the factory machinery then needs to mimic the wind. The lava enters a spinning machine that whips it into thin strands of stone wool. The addition of some binding solution oil helps to hold the strands together. Another machine layers several sheets of wool on top of each other, then a conveyor belt passes them through a series of rollers that compress the wool into a dense mat and improve its structure.
Do not add any nutrients to your Rockwool Cubes. The one on the left got nutrients, the other two did not.
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.
Step 3: Leave Them Alone And Let Them Grow
This method involves placing seeds in a container filled with water rather than into a plug or the soil.
Next, transition them to either soil or plugs.
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.
“Rockwool” is one of those trademarks that went on to become the generic term for this type of product. Just like Velcro or Aspirin, which are also trademarks, Rockwool is used to describe most products under this umbrella, and often drops the capital “R”—much to the chagrin of the trademark holders.
Swap to a flowering nutrient and gradually increase pH over a week from 5.5 to 5.8–5.9.
Growing Cannabis In Rockwool
Soak the rockwool for 24 hours in a nutrient solution corrected to a pH of 4.5 with an EC of 0.4–0.5. This range will make sure that young plants get off to a solid start with no nutrient deficiencies.
These top tips for growing in rockwool will make sure your indoor grow is successful.
Continue as per week 7. Depending on specific strain demands, EC can be increased to 1.8.