How Much Epsom Salt Should You Use for Cannabis?

If you’re curious about how much Epsom salt you should use for cannabis , you’re in the right place. In this blog post, we’ll cover the basics of using Epsom salt for cannabis and give you some tips on how to get the most out of your plants.

Checkout this video:


Cannabis plants are known to be heavy feeders, and they can quickly deplete the nutrients in your soil. One way to replenish those nutrients is by using Epsom salt (magnesium sulfate).

Epsom salt can help your cannabis plants achieve optimal growth by:

-Improving nutrient absorption
-increasing chlorophyll production
-preventing root bounding
-stimulating fruit and flower production

But how much Epsom salt should you use for cannabis? Read on to find out.

The Science Behind Epsom Salt and Cannabis

Over fifty percent of the world’s population is magnesium deficient, and Epsom salt can help correct that. Cannabis plants are also magnesium deficient, which is why Epsom salt is often used as a nutrient supplement. But how much Epsom salt should you use for cannabis? Let’s find out.

What is Epsom Salt?

Epsom salt is a mineral compound made up of magnesium sulfate. It’s named after a bitter saline spring in Epsom, England, where the compound was first distilled from waters in the early 17th century.

Today, Epsom salt is most commonly used as a laxative or magnesium supplement. But it has a long history of medicinal use, dating back to ancient Greece, when it was prescribed for a variety of ailments.

Epsom salt is also popular in gardening. It’s often used as a soil amendment or fertilizing agent because it’s rich in magnesium sulfate, which is essential for plant growth.

When it comes to cannabis, Epsom salt can be used as a nutrient solution or soil amendment. It’s thought to increase yields and improve plant health. Some growers even use Epsom salt to treat nutrient deficiencies.

How Does Epsom Salt Work with Cannabis?

The benefits of Epsom salt for cannabis have been well-documented, and the science behind it is pretty simple. Epsom salt is a type of magnesium sulfate, which is a chemical compound that’s made up of magnesium, sulfur, and oxygen. When dissolved in water, Epsom salt creates a magnesium-rich solution that can be absorbed through the skin.

Magnesium is an essential element for plant growth, and it’s especially important for the development of strong roots. Cannabis plants are known to be particularly high in magnesium, which means that they can benefit greatly from an Epsom salt solution.

In addition to being absorbed through the roots, magnesium can also help to regulate the uptake of other nutrients, including nitrogen and phosphorus. This makes Epsom salt an ideal way to ensure that your plants are getting the nutrients they need to grow healthy and strong.

The Benefits of Using Epsom Salt for Cannabis

Epsom salt can improve the quality of your cannabis plants. It can help to increase yields, improve the taste of the buds, and make the plants more resistant to pests and diseases. Let’s take a look at how to use Epsom salt for cannabis and the benefits of doing so.

Increased Nutrient Uptake

Epsom salt is a great way to increase the nutrient uptake of your cannabis plants. By adding Epsom salt to your watering schedule, you can help your plants absorb more nutrients from the soil and grow healthy and strong.

Epsom salt is also helpful in preventing nutrient deficiencies. If your plant is not getting enough of certain nutrients, adding Epsom salt to the soil can help correct the imbalance and ensure that your plant gets the nutrients it needs to thrive.

In addition to increasing nutrient uptake, Epsom salt can also help improve drainage in heavy clay soils. By improving drainage, Epsom salt can help reduce the risk of root rot and other problems associated with waterlogged soils.

Improved Plant Health

Epsom salt is a tried and true way to improve plant health. It can be used as a soil amendment or as a foliar spray. When used as a soil amendment, Epsom salt can help increase nutrient uptake, improve drainage, and reduce compaction. As a foliar spray, Epsom salt can help plants recover from stressors like extreme heat or cold, too much or too little water, and pests.

Enhanced Flowering

Epsom salt can help your cannabis plants by providing magnesium and sulfur, two important nutrients for plant growth. Magnesium is essential for photosynthesis and for the synthesis of chlorophyll, while sulfur is necessary for the production of enzymes and vitamins. By using Epsom salt, you can help your cannabis plants to produce more flowers and to grow healthier overall.

In addition, Epsom salt can also help to improve the drainage of your soil and to make it easier for roots to access water and nutrients. This can be especially beneficial in areas with clay soils or in soils that are prone to compaction. By improving drainage, you can help your cannabis plants to avoid problems such as root rot and nutrient deficiencies.

How to Use Epsom Salt for Cannabis

Epsom salt can be used to increase the potency of cannabis. It is also said to make the plant grow faster and produce more flowers. The salt can be added to the soil before planting or it can be added to the water when watering the plants.

Mixing Epsom Salt with Water

The recommended ratio of Epsom salt to water is 1 cup of Epsom salt per gallon of water. For most purposes, this will be a 1:16 ratio. You can either slowly add the Epsom salt to the water and stir until it’s completely dissolved, or you can add the water to the container first and then slowly pour in the Epsom salt while stirring. If you’re using a small container, you can also mix the solution in a larger container and then transfer it to the small container for storage.

Adding Epsom Salt to the Soil

If you want to add Epsom salt to your soil, mix it in before planting. It’s best to use about 1 pound per 100 square feet. You can also add it to the soil around existing plants, but be careful not to put it too close to the plant’s stem.

Foliar Spraying with Epsom Salt

Foliar spraying with Epsom salt is an effective way to deliver magnesium and sulfur to the leaves of your plants. Epsom salt is a natural mineral compound of magnesium and sulfate that is easily absorbed by plants.

To make a foliar spray, dissolve 2 tablespoons of Epsom salt in 1 gallon of water. This solution can be used to water your plants or sprayed directly on the leaves. For best results, spray your plants in the evening so that the leaves have time to absorb the nutrients before the sun dries them off.


Epsom salt can be a useful tool for cannabis growers, providing essential nutrients and improving water retention in the soil. However, it is important to use the right amount of Epsom salt to avoid damaging your plants. For best results, follow the recommended dosage on the product label or consult with a gardening expert.

Scroll to Top