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.
Download my free marijuana grow bible to know more about sulfur deficiency and other nutrient problems.
Signs of a sulfur deficiency
When the leaves begin to slim and get fragile, the plant’s 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.
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
- 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.
Give your weed plants a little extra love. Our Marijuana Fertilizer set has 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
- Pale color leaves
- Yellow leaves on new growth
- Yellow leaves on lower leaves
- Yellowing between veins
- Red or pink color on leaves
- Upper leaves and newer growth damaged
- Lower leaves and older growth damaged
- Yellowing between veins
- Reduced growth
- Limited growth
- 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 deficiency-free, do your best to feed it a balancing meal of all the proper nutrients it needs. Monitor your plant frequently and if any signs of deficiency pop up, just follow the suggestions listed and you will be just fine.
Grow weed plants with strong genetics to lessen the risk of dealing with plant diseases. Get started by buying high-quality marijuana seeds from a trusted seedbank.
FAQs About Sulfur Deficiency on Weed
If you notice pale, yellow or red/pink leaves, reduced growth and buds not thickening, your plant most likely has sulfur problems.
Among some ways to treat sulfur problems on weed is to use Epsom salts, elemental garden sulfur, gypsum or
potassium sulfate. You can also try our Marijuana fertilizer to give your cannabis plants the right mix of nutrients that it needs to thrive.
Have you dealt with sulfur deficiency on your cannabis plants? Please leave comments or questions below.
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]