How to Water House Plants with Epsom Salts


Epsom salts help nourish your houseplants by providing magnesium--the building block of leaves' green chlorophyll pigment. Also known as magnesium sulfate, Epsom salts dissolve readily in water and absorb into roots when soaked into the soil. Being organic, these nonsalt crystals do not harm plants, even when you accidentally add a bit too much when making a dosage.

Step 1

Fill your watering can or container with 1 gallon of water. Allow the filled container to rest for at least an hour to warm to room temperature and allow any chlorine additives to evaporate.

Step 2

Measure 1 tsp. of Epsom salts, add it to the water, and stir it in.

Step 3

Water your houseplants with the solution, following the same procedure you've always done when watering.

Step 4

Repeat the application of the Epsom salts solution to your houseplants again in three or four weeks. Use regular water for any watering needed between times.

Tips and Warnings

  • Avoid using cold water or water still smelling of municipal chlorine treatments. Chlorine in excess causes yellowing of houseplant foliage edges and leads to plant decline over long periods.

Things You'll Need

  • Watering can or bucket
  • Epsom salts
  • Measuring spoons


  • Epsom Salt Council: Garden Usage Tips
  • Cool Greenery: Epsom Salt Uses
  • Basic Info 4 Organic Fertilizers: Epsom Salt
Keywords: magnesium fertilizers, magnesium sulfate, epsom salt fertilizer

About this Author

James Burghardt has written for "The Public Garden," "Docent Educator," nonprofit newsletters and for horticultural databases, becoming a full-time writer in 2008. He's gardened and worked professionally at public and private gardens in Colorado, Florida, Minnesota, New York, North Carolina and Pennsylvania. He has written articles for eHow and GardenGuides.