Why Are My Marijuana Plant Stems Purple?

Seeing your marijuana plant with purple stems can be a little scary. You may become quite worried about the overall health of your plant, but this may not be as bad as you think. Below are some things you need to know about cannabis purple stems.

Purple marijuana stems

Let’s say you are growing your plants indoors, the plants are still fairly young and the leave are average in size, but you notice the stems have turned a purple color starting from the top.

purple weed stem
Purple stem

If you notice the stem of your seedling or marijuana plant has turned purple and there are no more indications of issues, this means their problem is genetic.

There are certain marijuana strains that automatically grow with purple stems, more so when the seedlings are budding, or even once the plants start receiving cooler temperatures during the night.

Solution for purple stems

If your plant seems to be in good condition aside from the stems being purple, refrain from making any changes for a one or two weeks. The majority of the time the plants will turn green fairly quickly. Provided that your leaves appear to be healthy and there aren’t any of issues you are aware of, most likely the purple stems are nothing to be concerned about.

If your marijuana plant is struggling to grow properly you might want to check out our list of nutrient deficiencies to get ahead of the issue!

If you suspect that your marijuana plant may have a nutrient deficiency, maybe because the plant growth has slowed down or the color of the leaves is fading, then your plant could be magnesium deficient. This can sometimes create purples stems.

purple stems cannabis
Plant with all stems purple

If this is the case, the issue will be resolved with ease by adding more magnesium the next time you water your marijuana plant.

Here are some great magnesium sources for your plants:

  • Epsom salt, just add 1 tablespoon per gallon
  • Cal-Mag
  • A nutrient solution that works well with marijuana has the proper amount of magnesium for your plants

Make sure to download my free Grow Bible for more information about purple stems cannabis.

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    Usually, your purple stem problem is nothing to worry about at all. But to be on the safe side check for any signs of magnesium deficiency. Take a look at our article on identifying magnesium deficiency for more detailed information. If there is no nutrient deficiency, then luckily, purple stem will only last for a short time.

    Thanks for reading. Please leave comments or questions below and don’t forget to download my free grow bible

    Robert

    FAQ cannabis purple stems

    What causes purple stems

    If you notice the stem of your seedling or marijuana plant has turned purple and there are no more indications of issues, this means their problem is genetic.

    How do you treat purple stems

    If you suspect that your marijuana plant may have a nutrient deficiency. If this is the case, the issue will be resolved with ease by adding more magnesium the next time you water your marijuana plant.

    How do you fix weak stems?

    If it’s stretching, add more soil right up to the first set of leaves to strengthen the stem.

    Avatar for Robert Bergman

    Robert Bergman

    Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations. His passion for growing led him to develop his own Gold Leaf strain. Now, Robert is dedicated to sharing his knowledge with the world.... [Read full bio]

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