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The Usage of Epsom Salt & Ammonia in Tomato Gardening

By Julie Christensen ; Updated September 21, 2017
Give your tomatoes a boost with Epsom salt and ammonia.
tomatoes image by Horticulture from <a href='http://www.fotolia.com'>Fotolia.com</a>

Tomatoes are among the most rewarding vegetables for a home gardener to grow. They taste infinitely better than their grocery store counterparts and require only a little help from you. To boost their growth, flowering and fruit production, try a couple of inexpensive home remedies--Epsom salt and ammonia. Epsom salt is magnesium sulfate. Magnesium is a nutrient needed for adequate plant growth. It is quickly depleted and often almost absent in Western United States gardens. Ammonia, according to the International Ag Labs, is a natural fertilizer that aids flowering and tomato setting.

Epsom Salt on Tomato Plants

Apply 1/2 cup Epsom salt to the soil when the tomato plant begins to bloom. Hoe it in lightly and water for 10 minutes.

Apply 1 tbsp. Epsom salt per foot of plant height to the soil, wet or dry. Repeat every two weeks during the growing season.

Mix 1 tsp. Epsom salt in a spray bottle with clean water. Spray on leaves to discourage tomato-loving insects.

Ammonia on Tomato Plants

Mix 2 cups vinegar, 1 cup ammonia and 5 gallons of water in a bucket.

Sprinkle lightly over plants when they begin to flower and set fruit.

Repeat the above process every two weeks for six weeks.


Things You Will Need

  • Epsom salt
  • Measuring spoon and measuring cup
  • Spray bottle
  • 2 cups vinegar
  • 1 cup BoPeep ammonia or similar brand
  • 5 gallon bucket


  • The ammonia formula listed is for a large garden with 10 or more tomato plants. Cut the solution by half or even one-fourth if you have a smaller garden.

About the Author


Julie Christensen is a food writer, caterer, and mom-chef. She's the creator of MarmaladeMom.org, dedicated to family fun and delicious food, and released a book titled "More Than Pot Roast: Fast, Fresh Slow Cooker Recipes."