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growing marijuana in rockwool

Growing marijuana in rockwool

Hydroponic cannabis grow using Rockwool

Hydroponic crop in Rockwool

In the 8th week of flowering, plants will receive the same number of irrigations, at the same duration as in the previous week, although we can raise the EC to 1.8 depending on the condition of the plants.

We must immerse the slabs for 24 hours in a nutrient solution that contains a pH level of 4.5 with EC levels of 0.5-0.6 – ideal to start growing with seeds without worrying about nutrient deficiencies.

5. How to grow in Rockwool

During the 6th week of flowering it will once again be necessary to increase the frequency of waterings from 4 to 6 per day. The first and last irrigation should last 2 minutes each and the four remaining waterings will each be 1 minute. The EC should still be at 1.4 and the pH continues fluctuating between 6.0 to 6.2 as in the previous week.

Once the cuttings are placed in the cubes we can treat them exactly as if they were in jiffies or coco, monitoring the humidity every day and spraying the cubes to keep a constant moisture on them to ease the rooting. As time goes by it will be necessary to lower the relative humidity until we can finally remove the cover of the mini-greenhouse and start to acclimatise the cuttings so that they don’t suffer when transplanted.

Over the 4th week and until the end of the 5th week of flowering we will again have to increase the frequency of irrigation to 4 waterings at day. The first and the last irrigation should each last 2 minutes, and the remaining two waterings should be 1 minute, distributed evenly through the day. EC levels should remain at 1.0 to 1.2, always taking into account the condition of the plants. We should keep the pH at 6.0 allowing it to fluctuate up to 6.2 to lower it again to 6.0 with pH down.

4. How to root cuttings in Rockwool

In the 9th and last week of flowering phase we will have to increase the duration of all the waterings to 2 minutes, with the pH adjusted to 6.2 and with EC levels as low as possible. We can take advantage of this last week to apply a flush product to help us wash the roots, leaving the plants’ metabolism free of any remaining salts and nutrients and ensuring a far better, cleaner aroma and flavour in the end product.

We can maintain this irrigation schedule, varying according to conditions and demand, until the first week of flowering when we will start to gradually increase pH from the initial level of 5.5 , raising it slowly over the course of the week to a level of 5.8-5.9 suitable for this stage of flowering.

Growing marijuana in rockwool

You don’t need to use Rockwool if you are planting outdoors, as it won’t work very well. It’s more of an inside technique, so be sure that you have a setup indoors that will work well with this substrate. Outdoor planting is better suited for soil, since it will be less fickle and you won’t have to watch it as closely.

After that happens, you can feel free to use it for whatever purpose you need.

You can also use this material when you’re growing something hydroponically. It’s able to hold moisture and can be rinsed out and cleaned whenever you need to.


The product is made by taking rock and ensuring that it isn’t all the way solid by heating it at very high temperatures. Essentially, it mimics lava in the fact that it makes the rock softer and able to be used for a variety of purposes.

This material is also a type of insulation, so you can use it to insulate any part of your operation as well. This also lets you know where you can purchase this product, if you need to buy some. You should be able to get some at home improvement stores, online, or at other specialty stores.

This isn’t necessarily for people with big gardens, as it’s better suited to growing just a few plants. This means you don’t have to have a lot of room to get started using this strategy. It can easily be done in your greenhouse, a shed, or similar.

How to use it

This permits the plant to start to develop into the vegetative stage without locking down roots. This means when it comes time to transplant the plants into soil, you can remove them without damaging any part of the plant, especially the delicate roots.

There are a number of ways you can grow cannabis in rockwool, including a number of different substrates to take advantage of. One substrate that is sometimes utilized is called Rockwool. It’s also known as mineral wool, and is essentially a type of rock that is a bit like fiberglass in the fact that it has pores and isn’t all the way solid.