Sulfur deficiencies in marijuana plants are quite rare. This is a good thing because good growing roots, the proper amount of chlorophyll, and the development of plant proteins are all processes aided by sulfur throughout the vegetation stage.

This deficiency is first noticeable when it causes newer leaves to yellow and in some cases the leaves may become orange or red. It may even resemble a nitrogen deficiency.

Signs of a sulfur deficiency

Signs of a sulfur deficiency cannabis

When the leaves begin to slim and get fragile, the plants growth will slow down. In contrast, the leaves will also be smaller. When in the flowering stage the buds begin to die off and the whole plants growth may slow down.

If the issue is serious, the veins of the plant may become yellow and the damaging parts will most likely show up at the bottom of the leaf. The slim, woody stems will continue growing taller but will not expand.

Download my free marijuana grow guide at this link for more growing tips

Having too much sulfur will reduce the size of your plant and cause the leaves to look dead and brown on the tips. Too much sulfur has the same damaging effect as salt with reduced growth and dark colors.

Not sure if your plants have a sulfur deficiency? Read the article Nutrient deficiencies in marijuana plants for a list with pictures of all deficiencies.

How to fix a sulfur deficiency

How to fix sulfur deficiency weed

The simplest way to cure a sulfur deficiency is by using Epsom salts (wiki). All you have to do is water the plant with Epsom salts and wait until it gets better. Use one, maybe two teaspoons of Epsom salts per gallon of water. If you have any other nutrients that have sulfur in it, feel free to add that as well. A good water-soluble fertilizer that contains sulfur will work just fine.

Here are some other choices:
  • Elemental garden sulfur
  • Gypsum
  • Potassium sulfate

Never put gypsum on soil that has a pH lower than 5.5. It can create an environment that is toxic to the plants.

Another excellent product you can use is Marijuana Booster. This will offer the perfect mix of nutrients to provide the greatest yields.

Last but not least, check and fix your pH levels to ensure the sulfur isn’t getting blocked out. Sulfur travels at a slow pace throughout the plant so it could be a few days once the issue is resolved before you will see that things are getting better for your plant. Read the article Check pH of Soil or Check pH of hydro for more information

List of marijuana plant symptoms

Sulphur Defficiencies On Marijuana Plants

Leaf color:
  • Pale color leaves
  • Yellow leaves on new growth
  • Yellow leaves on lower leaves
  • Yellowing between veins
  • Red or pink color on leaves
Leaf symptoms:
  • Upper leaves and newer growth damaged
  • Lower leaves and older growth damaged
  • Yellowing between veins
  • Reduced growth
Plant symptoms:
  • Limited growth
Other Symptoms:
  • Buds not thickening

Luckily sulfur deficiencies are very uncommon. You are less likely to have to go through the trouble of repairing this issue. To ensure your plant stays sulfur deficiency free, do your best to feed it a balancing meal of all the proper nutrients it need. Monitor your plant frequently and if any signs of deficiency pop up, just follow the suggestions listed and you will be just fine.

Remember that plants with strong genetics have less change of getting sick. Make sure you buy marijuana seeds from a trusted seedbank.

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


The founder of I Love Growing Marijuana, Robert Bergman, is a marijuana growing expert that enjoys sharing his knowledge with the world. He combines years of experience, ranging from small-scale grows to massive operations, with a passion for growing. His articles include tutorials on growing... [read more]


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  1. By 4 Week Vegetative – Iron Deficiency? -Auto flower- help ,25 Nov 2013
    […] Look at this link and see what you think... http://www.ilovegrowingmarijuana.com...ciency-sulfur/ Quid, Me Anxius Sum? (What, me worry?) ...Alfred E. Neuman Reply With […]
  2. By Stephen Kilford ,07 Jan 2015
    Leaves at bottom of plant are turning yellow and brown at the ends can some1 help
  3. By mike ,20 Jan 2015
    I am currently waiting for my order of Marijuana Booster to arrive. My question is about the water I mix it with . I have a chlorine scrubber to remove the chlorine from my tap water. DOES MARIJUANA BOOSTER adjust […]Read More
  4. By Symptom Checker – Identify Marijuana Plant Problems ,24 Jul 2015
    […] Sulfur deficiency […]
  5. By Jordan ,18 Jan 2019
    What would the ratio of gypsum to water that you should Use to correct a defic in Your plant grown in soil
    1. By latewood_ILGM ,29 Jan 2019
      Jordan. Gypsum is the least recommended remedy. If you still want to use Gypsum, then I recommend finding a source and following directions on the bag. You would be better off using Epsom salts, or sulfate of potash, or another […]Read More
  6. By David ,08 Apr 2020
    My leaves are starting to go yellow and curl in the way,I have forgot to give calmag 3 feeds sin a row now I flushed them and PhD the water the run of was all between 6.71 and 6.81 and […]Read More

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