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

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.

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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

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

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

Robert