September 26, 2018

In Part 1 we discussed one of the main reasons why the leaves are turning yellow on your cannabis plants and how to properly deal with it. Now, we continue with the other reasons why your leaves are turning yellow.

Your pH Levels are Too High/ Low

If your plant leaves are turning yellow, this is a sign that your pH level in your roots is off. This is especially common if you are growing in soil or hydroponically. One of the reasons this happens is because when your plants’ pH levels are even just slightly off they have a difficult time absorbing nutrients. When your pH levels are off, this can often lead to other nutrient deficiencies, which can be hugely detrimental to your plants.

How to Fix your pH Levels

If you’re growing in soil, your ideal pH level is 6-7. If you are growing hydroponically or in coco noir, your ideal pH is closer to 5.5-6.5. You can adjust your pH levels fairly easily by using a pH testing kit and testing your water’s pH before using it to water your plants. Depending on the pH balance you would add more acid or more base to the water. You can do this by adding solution that either increases or decreases pH, then retest as needed.

Poor Lighting

If your leaves are turning yellow, it might be because your plants are not getting enough light. You’ll know that your plants are experiencing poor lighting when your seedlings are tall, but the leaves appear proportionately smaller than they should considering the height of your plants. Another dead giveaway is that your plants look like they are “stretched out”, that is there is a lot of space between the stems and the leaves.

How to Fix Poor Lighting

Poor lighting is one of the easiest things to fix. All you need to do is simply add more light! One of the best ways to do this is to upgrade your lighting system. If you cannot afford to do this, you can also adjust the position of your lighting system, or the position of your plants if possible.

You’ve Got Pests!

If your leaves are turning yellow, this could be because you have pests infesting your plants! The good things about having pests (what there are good things?) is that they can easily be spotted. The worst thing is that they are damn near impossible to get rid of.  Typically pests are difficult to get, but they occur the most often in plants that are grown in a dirty environment, have poor circulation, as well as overwatering. Once pests have become adapted to living on cannabis plants they are hard to get rid of, but it is possible.

How to Take Care of an Infestation

It depends on what type of pest you are dealing with. If you have aphids, the best course of action is to get them off of your plants as quickly as possible. This can be done by taking them outside and spraying them off. Then use an insecticidal soap. These are safe to use on cannabis plants, as opposed to other insecticides.

Stay tuned for Part 3!

Featured Image Source: Grasscity

Got anything to add? Have advice for newer growers regarding yellowing leaves? Tell us in the comments!

Marijuana is more than an herb, it’s a lifestyle, and Sarah is your professional hostess. Our resident “stonette” writes commentaries on the latest news, shares relevant news for marijuana lovers, and generally writes about stuff she knows other cannabis enthusiasts will enjoy. With all the... [read more]


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