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Use Epsom Salt on Plants: Benefits and How to Apply (2023)

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use epsom salt on potted plantsYou’re a green thumb who loves nurturing plants. Maybe you’ve wondered if Epsom salt could boost your potted plants’ health.

Epsom salt contains magnesium and sulfur, both nutrients plants need. For indoor potted plants showing signs of magnesium deficiency – like yellowing leaves but green veins – Epsom salt could help.

Simply dissolve a tablespoon per gallon of water and use this to monthly water or mist plants’ leaves.

While some gardeners swear by it, the jury’s still out on how well it works for plants not deficient in magnesium.

Read on to learn when and how to use epsom salt on potted plants, and whether it’s right for your green friends.

Key Takeaways

  • Mix 1-2 tablespoons of Epsom salt per gallon of water and use as a foliar spray or soil drench every 2-4 weeks to provide magnesium.
  • Properly dilute the Epsom salt solution to avoid leaf burn; start with 1 teaspoon per gallon and gradually increase.
  • Look for signs of magnesium deficiency like yellow leaves with green veins to determine if Epsom salt is needed.
  • Combine Epsom salt with regular fertilizer cautiously, starting with half the normal Epsom rate to prevent over-fertilizing.

What is Epsom Salt?

What is Epsom Salt
Epsom salt’s magnesium-sulfate minerals green up potted plants and coax out pretty blooms – just be sure first that yellowing leaves need magnesium, not another nutrient.

Epsom salts are simply magnesium sulfate, a mineral compound comprised of magnesium, sulfur, and oxygen. The magnesium and sulfur provided by Epsom salt are both essential plant nutrients required for photosynthesis, protein and enzyme production, and overall healthy foliage and flowering.

When magnesium levels are low, often the first sign is interveinal chlorosis, or yellowing between the leaf veins while the veins remain dark green.

While Epsom salt does provide readily available magnesium to deficient plants, it isn’t a complete fertilizer. Potted plants also require nitrogen for lush growth, phosphorus for root and flower development, potassium for disease resistance and water regulation, calcium for cell wall strength, and other micronutrients.

Depending on your specific plant needs, Epsom salts alone may not do the job. Consider having your soil analyzed to pinpoint any nutrient shortages so they can be properly amended.

Epsom salt is an easy DIY treatment though when magnesium is lacking. Follow label directions for mixing about 1-2 tablespoons per gallon of water and applying every 2-4 weeks. Observe your plants for improvements in leaf color and plant vigor. If foliage remains yellow with green veins, another nutrient deficiency is likely the cause.

Why Use Epsom Salt on Plants?

Why Use Epsom Salt on Plants
Have your blooms lost their dazzle and foliage turned pale? With a mixture of Epsom salt, a potent magnesium fertilizer, you can restore floral displays and boost fruiting while verdant leaves return. By addressing magnesium deficiencies, this simple supplement stimulates blooming, enhances production, and cures chlorosis so growth thrives.

Treats Magnesium Deficiency

Treating magnesium deficiency in potted plants, apply the mineral supplement monthly to invigorate chlorophyll production and encourage healthy blooms.

  1. Mix 1-2 tbsp Epsom salts per gallon of water.
  2. Spray diluted solution on leaves every 2-4 weeks.
  3. Focus on new growth and undersides of leaves.
  4. Add more for blooming plants, up to 2 tbsp/gallon.
  5. Observe improvements in leaf color and plant vigor.

Magnesium is essential for chlorophyll production and nutrient absorption in plants. Without adequate magnesium, leaves turn yellow while the veins remain green – a telltale sign of deficiency. Epsom salts provide a readily available form of magnesium to correct this. Mix a foliar spray and apply liberally right to the leaves where it can be quickly taken up.

The magnesium in the diluted Epsom salts will green up chlorotic foliage by enhancing chlorophyll synthesis. Consistent monthly applications ensure your potted plants can maximize growth and achieve their full blooming potential.

Aids Flowering and Fruiting

Put 2 tablespoons per gallon monthly on your plants when they start flowerin’ to give ’em the magnesium boost needed for bountiful blooms and plentiful fruit. This mineral supplement aids in crucial enzyme and protein formation required for plant reproductive processes.

Chlorophyll production maximizes when magnesium levels are optimal, resulting in greener leaves and better ability to photosynthesize. This converts to more energy available for flowering and fruit production. Apply diluted Epsom salts as a monthly foliar feed to ensure your potted plants reach their highest potential for prolific propagation and delicious yields.

Houseplants Vegetables Fruits
African Violets Tomatoes Citrus
Orchids Peppers Berries
Bromeliads Cucumbers Melons

How to Apply Epsom Salt

How to Apply Epsom Salt
Looking to improve the health of your houseplants and indoor gardens? A diluted Epsom salt solution as a foliar spray or soil drench offers an easy way to give potted plants a nutritional boost. For a foliar spray, mix 1-2 tablespoons of Epsom salt per gallon of water and mist leaves, avoiding hot sun.

For soil application, use 1 teaspoon per gallon of water monthly to build up magnesium at the roots. Be careful not to overapply, as salt buildup can damage plants. With the right dilution, Epsom salt absorbs quickly to green up leaves and stimulate flowering.

Foliar Spray

Get greater results by mistin’ your plants with an Epsom salt spray monthly. This easy treatment delivers magnesium and sulfate directly to leaves, givin’ chlorophyll production a boost. Just mix 1 tablespoon Epsom salts per gallon of water. Spray in the early mornin’ or evenin’ when temperatures are mild.

Wet both sides of foliage until droplets accumulate, but not to the point of runoff. The magnesium absorbed through leaves provides near immediate relief from deficiencies like yellowin’.

Repeat applications every 2-4 weeks durin’ the growin’ season to keep potted plants at peak performance.

Remember, Epsom salt sprays are a supplemental treatment, not a replacement for fertilizin’. But this mineral supplement will keep houseplants and container gardens lookin’ their healthy best in a simple, inexpensive way.

Soil Application

Surprise your potted plants by sneakin’ Epsom salts into the soil for a magnesium boost they’ll never see comin’! Mix 1 tablespoon Epsom salts per gallon of water, then saturate the root zone every 2-4 weeks.

  1. Green up leaves
  2. Produce more blooms
  3. Strengthen plants to resist disease and pests

Epsom salt affects plants quickly when applied as a foliar spray. But incorporatin’ it in the soil steadily nourishes roots over time with sulfur and magnesium. Don’t let your potted plants miss out on these essential nutrients for long-term health and productivity.

Epsom Salt Tips

Epsom Salt Tips
When using Epsom salt on your potted plants, it’s crucial to dilute it properly and use it at the right frequency. To avoid burning delicate leaves, mix just 1-2 teaspoons of Epsom salt per gallon of water.

Apply this diluted solution once every 2-4 weeks during the growing season to provide a gentle, steady supply of magnesium to your plants. Be careful not to overdo it with the Epsom salt, as too much can build up in the soil and damage plant roots over time.

With the proper dilution and application schedule, Epsom salt can give your potted plants a nice nutritional boost without harming them.

Proper Dilution

When nurturing your potted green companions, a teaspoon of Epsom salt per gallon drizzled monthly waters their roots and whispered wishes of bountiful blooms. As any devoted cultivator knows, balancing nutrients promotes vigorous growth. This magnesium-rich elixir feeds foliage and flowers when misted above soil.

Belowground, salty crystals diffuse, entering the root zone to correct deficiencies.

Carefully mix one teaspoonful into each gallon of water. Test spray on a single leaf, watching for scorching before thoroughly dousing.

Monitor moisture, allowing soil to dry between Epsom salt solutions. With this measured monthly meal, your potted plant partners can thrive.

Attend to their needs, and enjoy nature’s living tapestries weaving greenery into your home.

Application Frequency

Hug your tenders lovingly but sparingly with Epsom’s magic, friend. Each month, one teaspoon per gallon graces roots, yet measure mindfully. Too frequently fertilizing even nature’s remedies risks burning delicate foliage.

For seedlings or transplants, saline crystals may shock struggling sprouts. Press a grain into each cell, watering lightly.

Once established, biweekly or monthly meals nourish growth. In garden soil before planting seeds or around tomato plants, sprinkling benefits germination and formation. Blend into potting mix when potting up. Epsom salts encourage abundant blossoms, but continually testing and observing your lovelies leads to the perfect balance between feast and famine.

Tend with care.

Buying Epsom Salt

Buying Epsom Salt
You’d hit the jackpot grabbing Epsoak’s 25-lb bag for steadfastly nourishing your potted botanicals. This bulk supply means you can lavish your leafy loves with the magnesium sulfate crystals they crave.

Simply mix a teaspoon per gallon once a month and watch your plants thrive on the steady mineral nutrition.

  • Boosts healthy green growth and brilliant blooms
  • Alleviates yellowing leaves plagued by deficiency
  • Aids recovery from transplant stress
  • Deters pesky insects with an occasional foliage misting

With Epsom salt’s soluble crystals saturating the soil, your potted pals absorb the sulfur and magnesium vital for photosynthesis and enzyme production. The key is proper dilution and application to avoid leaf burn or excess salt buildup over time.

Tend your plants with the right balance, and they’ll reward you with vigorous good health.

Frequently Asked Questions (FAQs)

How often can I use Epsom salt on my potted plants?

You can use Epsom salt on potted plants every 2-4 weeks during the growing season. Test on a few leaves first to check for sensitivity. More frequent application risks buildup in the soil and leaf damage.

Consider the plant’s needs, growth stage, and prior response when deciding frequency.

Is Epsom salt safe for all plants or are some species sensitive to it?

Most plants tolerate Epsom salt application, but test on a few leaves first. Certain species such as azaleas, camellias, and junipers are especially sensitive, so avoid use or dilute more. Look for leaf scorch and adjust the concentration as needed. Begin with a weak solution and increase gradually.

Can I mix Epsom salt with my regular fertilizer or should I use it separately?

You can mix Epsom salt with your regular fertilizer, but use caution. Start with half the recommended Epsom rate to avoid potential leaf burn. Monitor your plants closely and adjust the ratio as needed. Epsom works best as a supplemental treatment in moderation.

What signs or symptoms indicate my potted plant has a magnesium deficiency?

You’ll notice yellowing leaves with green veins first. Check light and moisture before assuming it’s magnesium. Also test soil pH, as magnesium uptake depends on it. If the deficiency is confirmed, an Epsom salt soak should perk it up within days.

Are there any risks to pets or children from using Epsom salt on potted plants?

When using Epsom salt on indoor plants, keep pets away until it’s absorbed. Dilute properly and do not over-apply, as concentrated salts could cause stomach upset if ingested.


While epsom salt may seem an unlikely aid, this humble mineral supplement can work wonders in your garden. Contrast the powder’s medicinal reputation with its ability to energize houseplants and invigorate outdoor plantings.

Whether easing a deficiency or boosting blooms, epsom salt’s magic touch provides a simple, inexpensive way to give your plants a boost.

So expand your horizons and discover new possibilities with an age-old remedy from the bath aisle.

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Mutasim Sweileh

Mutasim is a published author and software engineer and agriculture expert from the US. To date, he has helped thousands of people make their yards lush and thick.