How often should I put Epsom salt around my plants?

Author: Scot Brakus  |  Last update: Tuesday, February 24, 2026

Adding Epsom salt is a simple way to increase the health of their blooms, and is something that you can include easily as a part of a normal routine. For potted plants, simply dissolve two tablespoons of Epsom salt per gallon of water, and substitute this solution for normal watering once a month.

How often should Epsom salt be used on plants?

Houseplants — Apply 2 tablespoons of Epsom salts per gallon of water once a month. Shrubs (evergreens, rhododendrons and azaleas) — Use 1 tablespoon of Epsom salt per 9 square feet and slowly pour it over the root zone, allowing it to soak in, every two to four weeks.

Can too much Epsom salt hurt plants?

Excessive levels of magnesium sulfate can cause salt injury to plants. The unnecessary use of Epsom salt will not result in better plant growth but can actually make growth worse.

Which plants love Epsom salt?

Epsom salt can deliver great results in gardens that have a magnesium deficiency when used correctly. Roses, tomatoes, peppers, pansies, petunias, and impatiens particularly love Epsom salt, and all need high levels of magnesium for optimal growth.

What not to mix with Epsom salt?

Don't Mix Epsom Salts with Pure-Castile Soap. Don't mix Epsom salts with any true soap, including Dr. Bronner's Pure-Castile.

How to use Epsom Salt in the Garden and on Your Potted Plants

Can I sprinkle Epsom salt around my plants?

Bottom line: No, Epsom salt is not beneficial for plants. One reason people use Epsom salts is to prevent blossom-end rot. This isn't true. In fact, Epsom salts can be harmful!

What does baking soda do for plants?

Prevent Fungal Disease

MAKE IT: Mix 1 teaspoon of baking soda and 2-3 drops of liquid soap in 1 liter of water. Spray the solution on the infected plants. Baking soda helps the plants become less acidic and prevents fungal growth.

Does Epsom salt keep bugs away?

Here are a few ideas for using Epsom salt as pesticide: Epsom Salt Solution Insect Control– A mixture of 1 cup (240 ml.) Epsom salt and 5 gallons (19 L.) of water may act as a deterrent to beetles and other garden pests.

Are coffee grounds good for plants?

Are coffee grounds good for plants? Coffee grounds are an excellent compost ingredient and are fine to apply directly onto the soil around most garden plants if used with care and moderation. Coffee grounds contain nutrients that plants use for growth.

How do I know if my soil needs calcium?

Symptoms of calcium deficiency include stunted plant growth, leaf curling, dark leaf veins, weakened plants, and blossom-end rot in fruits. Fruit plants like tomatoes and peppers may develop dark, sunken areas in the fruit.

What are the symptoms of magnesium deficiency in plants?

In magnesium-deficient palms, leaf tips turn bright yellow, while leaf bases and along the midrib remain green. Lower (older) fronds may die prematurely. In magnesium-deficient broadleaves, foliage can become chlorotic or chlorotic and necrotic.

Are there any plants you should not use Epsom salt on?

Carnivorous plants — Pitcher plants, venus flytraps, and sundews are some insect-eating plants that should not be applied with Epsom salts.

Can you use hydrogen peroxide on plants?

Saturate the soil with 1/2 cup hydrogen peroxide 3% per 1 litre water. Put wet soil in a watertight container and leave overnight before planting. This kills pathogens such as fungi and bacteria including insect eggs and nematodes (roundworms).

Can I sprinkle Epsom salt around my tomatoes?

There's one situation gardening experts agree can call for supplementing with Epsom salt—that's when your tomato plants have a magnesium deficiency. "Magnesium deficiency usually appears as leaves with bright green ribs and veins and otherwise discolored areas of yellow, red, or brown," Koehn says.

What does vinegar do to plants?

Vinegar is a contact herbicide, so you can unintentionally kill plants in your garden if you accidentally spray them with vinegar. Using vinegar as a weed killer works best on newer plants. "On more established plants, the roots may have enough energy to come back even if the leaves you sprayed have died.

Can I mix Epsom salt and baking soda for plants?

Heat a cup of water and stir in baking soda and Epsom salt until they dissolve. Then, pour the water into a larger container and fill with the rest of the water, plus ammonia. Once it's all stirred, you can pour the fertilizer mixture over your plants every few weeks.

Is beer good for plants?

One of the single best uses for unfinished opened beer is as a compost pile jump starter. The sugars and yeast in beer are excellent for your compost pile. Simply pour it over your compost pile and then stir or turn it when required. Beer can be used as an effective fungicide for your plants.

Can I give my plants too much Epsom salt?

Adding Epsom salts to soil that already has sufficient magnesium can actually harm your soil and plants, such as by inhibiting calcium uptake. Spraying Epsom salt solutions on plant leaves can cause leaf scorch. Excess magnesium can increase mineral contamination in water that percolates through soil.

Which plants don't like eggshells?

"Plants like strawberries, blueberries, kale, and cabbage prefer slightly acidic soil and adding in eggshells can do more harm than good," says Jen McDonald, certified organic gardener and co-founder of Garden Girls, a garden design company based in Houston, Texas.

Can I mix coffee grounds and eggshells together for my garden?

Depending on the size of your garden, compile enough of each component to contribute a moderate amount to each hungry plant. Combine the two together, crush the eggshells by hand even more (which should be easier now that they're fully dry), and sprinkle the mixture across the soil bed.

What are the negative effects of Epsom salt?

Consuming Epsom salt can lead to side effects, including diarrhea, irregular heartbeat, and muscle weakness.

How to apply Epsom salt to plants?

Where/how to apply: Water the base of the plants with the Epsom salt solution, ensuring the roots can absorb the nutrients. You can also use it as a foliar spray, applying directly onto the foliage every four to six weeks.

What happens if I put too much Epsom salt?

What happens if I overdose? Overdose symptoms may include nausea, vomiting, flushing (warmth, redness, or tingly feeling), feeling very hot, slow heart rate, extreme drowsiness, or fainting.

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