How to Apply Epsom Salts to Palm Trees

2015-9-7 by Sarah Mason, Demand Media


Epsom salt, also known as magnesium sulfate, is a naturally occurring pure mineral compound of magnesium and sulfate. In the garden, Epsom salt can be used as a fertilizer for palm trees (of the family Arecaceae,) which are hardy in U.S. Department of Agriculture plant hardiness zones 1 to 10. Palm trees are susceptible to magnesium deficiencies and can benefit from magnesium supplements; the magnesium sulfate in Epsom salt is both quick-release and water-soluble so that, when applied to the soil around palm trees, can help prevent such deficiencies.

1. Place Epsom salt in a plastic zip bag and tap it lightly with a hammer or roll over it with a rolling pin to break up the crystals. This will allow for more even application.

2. Place the potassium sulfate in a separate plastic zip bag and tap lightly with a hammer or rolling pin to break up the crystals. Potassium sulfate is a white crystalline salt which is soluble in water and will be used to balance the magnesium.

3. Scatter the Epsom salt crystals evenly around the root zone of the palm trees at a rate of 2 tablespoons per 9 square feet (3 feet by 3 feet).Prilled kieserite Epsom salt is a slow-release form of magnesium and should be applied once every four months during the growing season, according to the University of Florida Extension.

4. Apply the same quantity of potassium sulfate (2 tablespoons per 9 square feet) evenly around the root zone of the palm trees at the same time that you apply the Epsom salt. The balance of potassium and magnesium is important in palm trees and too much of one can result in the deficiency of the other. Therefore, it is necessary that magnesium and potassium are always applied together.

5. Water the palm trees well after application to help dissolve the Epsom salt and potassium sulfate into the soil.


Things You Will Need

Epsom salt (prilled kieserite)

Pottassium sulfate

Plastic zip bag

Hammer or rolling pin



Do not rely solely on Epsom salt to correct magnesium deficiencies; it is best used as a supplement.

Epsom salt should not be used as a stand-alone palm tree fertilizer.