Is Epsom Salt Good for Houseplants?

Epsom salt is a common household item with a wide variety of uses. It’s affordable, natural, and easy to access, so you might be wondering — is there a way that epsom salts can help my potted plant?

The answer is yes, there are situations where epsom salt can be very good for houseplants. Because of its nutrient content, epsom salt can be a powerful tool for keeping your indoor plants healthy. Epsom salt ranks alongside banana peels, egg shells, and hydrogen peroxide as one of the best household items for plants.

What is Epsom Salt?

Epsom salt is the common name of hydrated magnesium sulfate. Epsom salt can be used to relieve sore muscles, as a magnesium supplement, and even as a laxative. It can be found in any drug store or grocery store, or online in places like Amazon.

Epsom salt can also be used to make your plants happier and healthier — and that includes your potted plants. Just a small does of this amazing compound can do wonders for your vegetable garden, rose garden, or house plant collection.

What Plants Like Epsom Salt?

Many plants can benefit from the boost of magnesium that epsom salt provides., but there are a few that especially love it. Here are some plants that respond well to epsom salt.

Tomato Plant

Epsom salt is a great choice for the tomato plants in your garden. The added mangnesium from epsom salt will make your tomatoes tastier, will correct yellowing leaves from a magnesium deficiency, and will help prevent blossom end rot.

To treat your tomatoes with epsom salts, add one tablespoon of salt to a gallon of water for every twelve inches of height your tomato plant has. Water with this fertilizer solution twice a month for best results.

You can also use epsom salts when planting tomato seeds or seedlings. Add 1/2 tablespoon to your planting hole and work through the soil thoroughly. Then, plant your seeds or seedlings as normal.


Roses also love the high levels of magnesium found in epsom salt. Epsom salt will give your roses larger, more colorful blooms, and can help deter pests like slugs. If you’re growing roses outdoors, you’ll want to make sure you’re using epsom salt to fertilize them.

The best way to administer the salt to your rose plants is directly into the soil. Take 1/2 cup of epsom salt and mix into the soil around your rose plant thoroughly.


Much like tomatoes, epsom salts also do amazing things for your pepper plants. Epsom salt can help your peppers avoid blossom end rot and can also help your plant produce larger, tastier fruit.

The best way to use epsom salt on peppers is a foliar spray. To create this spray, mix two tablespoons of epsom salt with a gallon of water and spray heavily on your plant’s leaves. Spray with this diluted epsom salt solution once a month, in place of a scheduled watering.

How to Use Epsom Salt to Fertilize Houseplants

You might think that because epsom salt works so well for outdoor plants, it must also be a great fertilizer for indoor plants. The truth is that epsom salt can be helpful for houseplants, but only in certain situations.

Epsom salt is a great choice for potted plants that are showing signs of a magnesium deficiency. If your houseplant has leaves that are yellowing while the veins remain green, there’s a good chance your plant has a magnesium deficiency.

To treat a house plant with a magnesium deficiency, mix about one tablespoon of salt with a gallon of water and put this solution into a spray bottle. Use this foliar spray to fully moisten all areas of your houseplant. This method will get the nutrients to your plant more swiftly than applying through the roots, and you’ll soon see beautiful green leaves again.


Epsom salt is one of the most versatile tools you have in your closet. It can help you with your personal health and wellness, and also with your garden and houseplants. If you need to find a way to support plant growth and add some magnesium to your plant’s “diet,” consider turning to the affordable help epsom salt provides.

Kate Inskeep

Kate Inskeep is a mom of three from Illinois who loves growing things. She fell in love with houseplants after a friend gifted her some succulents. Before long, her windowsills were full of plants, and she was hooked.

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