How to Use Epsom Salt on Plants

Updated June 18, 2018

Epsom salts are not actually made from sodium like table salt. Epsom salts are made from magnesium. Many plants are planted in soil that is deficient in magnesium. Epsom salts can be used to restore the balance of magnesium, and help the plants grow to their full potential.

Add 2 tbsp of Epsom salt to each hole before planting your seeds. This is recommended for plants such as tomatoes.

Sprinkle 1 tsp of Epsom salt around the base of the plant for each foot tall the plant currently is. If you have a plant that is 2 feet tall, then you would sprinkle 2 tsp of Epsom salt around the plant.

Press the Epsom salt into the soil around the base of the plant by scratching with your fingers or gardening gloves.

Repeat monthly.

Pour 1 gallon of water into a bucket.

Add 1 tsp of Epsom salt.

Mix the two ingredients and then pour some of the mixture into a watering can.

Pour over the houseplants once every two weeks. Use regular water in between.


If your houseplants are thriving, you can cut back the Epsom salt solution to once per month.


If the soil you are using is not deficient in magnesium, you do not need to use the Epsom salts.

Things You'll Need

  • Epsom salt
  • Measuring spoon
  • Watering can
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About the Author

Alicia Bodine has been a professional writer for 13 years. She has produced thousands of articles for online publications such as Demand Studios, GoBankingRates and WiseGeek. Bodine is passionate about gardening, travel, education and finance. She has received awards for being a top content producer.