Signs Your Cannabis Plant May Need Help

Liz Filmer
06 Sep 2022

A cannabis plant is hardy, but how you look after it will negatively impact its health and vigour. If your plant is denied essential nutrients and this is not rectified, it can result in stunted plant growth or even worse death. Cannabis deficiencies can be hard to identify, so below is an essential list of what to look out for.

You are bound to experience problems when growing cannabis. Thankfully these plants are resilient and can stand up on their own in the face of pests or hostile growing conditions for a while. But if the problem isn’t rectified promptly, negative influences will occur.

A big mistake growers make is using extreme action when you might not necessarily need it. If a dodgy situation is spotted, growers should acknowledge that and take the time to learn how to fix the problem correctly.

Many common problems can be identified simply by inspecting the leaves. This is not an exhaustive list, but here are some common growing problems and how they may present on cannabis leaves. 

  • Yellow leaves: Can be a sign of any deficiency or of light burn.
  • Leaves curling upward: Can point toward a potassium deficiency or be a symptom of overwatering.
  • Brown leaves: May indicate phosphorus, potassium, magnesium, sulphur, and manganese deficiency. It may also be nutrient burn (more solid brown colouring) or heat stress (brown on the edges).
  • Droopy leaves: Could be a sign of overwatering.
  • Leaves curl downwards: This could indicate potassium or phosphorus deficiency or overwatering.

 Cannabis Deficiencies Explained

You can avoid nutrient deficiencies by being attentive and careful with the pH level of your nutrient-water solution. Your plant is deficient in these nutrients because they are not able to absorb them.

Incorrect levels of some nutrients will lock out others thus inducing adverse effects. If your feeding regime it’s probably that the pH is either too high or low, and the plant is not absorbing them.

You can generally remedy a nutrient deficiency by flushing your plant with water to bring it back within the target pH range for optimum growth. It would be advisable to adjust your feed ratios and monitor your pH and EC going forward.



Liz Filmer