If your marijuana plants are looking pretty sad with foliage discoloration and limp yellow leaves, yet you’ve been feeding them all the nutrients in the world then you may be experiencing nutrient lockout. Nutrient lockout has basically the same symptoms as nutrient deficiency, after all that is essentially what is going on in your plant. Your plant is not absorbing any nutrients in the soil, thus adding more and more nutrients may be pointless. So, if you are certain you have fed it enough nutrients and the plant shows you the same symptoms as nutrient deficient, you have nutrient lockout.
There are a few reasons why you might be experiencing nutrient lockout. Either your pH is too low, too high, or it fluctuates. Extreme acidic or alkaline will cause nutrient lockout. Cannabis grows best in water or soil with a pH level between 6.0-6.5.
Long Periods of time
Another reason why you might be experiencing nutrient block is because there is a chemical reaction between 2 nutrients that cause your plant not to take in nutrients through its roots. A buildup of salt in your soil can cause nutrient lockout as well as using aged soil enhancers. Old nutrients can precipitate in the bottle which causes some of the ingredients to become solid or evaporate. One way to avoid this would be a powder fertilizer like, Flower Power Fertilizers. These are concentrated, powder based and sealed in air tight bags so that evaporation doesn’t occur and you can keep it stored for long periods of time.
The good news is that nutrient lockout is not necessarily terminal. Flush those babies and say a prayer- you’ll soon be on your way to a thriving garden yet again! Make sure to flush your soil thoroughly with pure water for a few days. This will remove excess salts and get you to start fresh with nutrients. Hydroponically speaking, do a full flush (you did read my other blogs how to do that yes?) and start with pure water again. Get a very decent pH meter and focus on making sure the pH falls within range of 6.0-6.5.
These very helpful tips should get you through a lockout. Remember that too much of a good nutrient is not good at all.