When you have an indoor marijuana garden, soil is also a relatively important aspect to keep your eye on. It’s also something that you have more control over. As noted previously, marijuana prefers to grow in a nutrient-rich soil that has a neutral pH of around 7.0. Sometimes, however, the pH in the soil can shift quite far out of the comfortable range from 6 and 8 on the scale. Some drastic measures might need to be taken in order to ensure that the soil does not end the life of your plants. One method of reducing chemical contamination in the soil is by using a soil flush.
This is generally not a recommended step to take, but it might be necessary in some situations. In reality, it should only be used as a last resort when trying to keep your marijuana plant alive. It essentially involves taking your entire plant with the pot included and placing it in a sink. From there, you turn the faucet on and let the water run through the soil so that it eliminates any of the contaminants that might have been harming the plant. The danger with this method is that you run the same risk of killing the plant by oversaturating the soil with water as you do by contaminating it with too many nutrients. But, sometimes this is the only way to ensure that the additives don’t kill your marijuana plants.
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For less serious issues, there are other options. If your soil pH drops below the recommended 6.0 and becomes too acidic, then you can simply add some lime to the soil next time you water it. This should get the pH back within the acceptable range between 6 and 8. If the soil is above 8 and too alkaline, you might consider adding some concoction of cottonseed meal, lemon peels, and ground coffee. Some fertilizers are also made to be highly acidic and can bring down the alkalinity if they are applied to the soil. In any event, it’s always a good idea to keep checking the pH balance of your soil, otherwise you could be in for a disappointing surprise.