How to Use Epsom Salt for Hibiscus Plant?

Epsom salt, also known as magnesium sulfate, is a mineral compound that offers numerous advantages for plant growth. It contains magnesium and sulfur, two crucial elements that contribute to the overall health and development of hibiscus plants.

Magnesium is essential for chlorophyll production, which gives leaves their green colour and helps with photosynthesis. And sulfur promotes strong root systems and enhances the plant’s ability to absorb nutrients from the soil.

Using Epsom salt for hibiscus plants can promote healthy growth and vibrant blooms. It provides essential nutrients like magnesium and sulfur, supporting chlorophyll production and root development.

Dissolve 1 tablespoon of Epsom salt in 1 gallon of water and it’s ready for your hibiscus plant.

Using Epsom salt for your hibiscus plants is a simple and cost-effective way to support their well-being. By providing the necessary nutrients, you can encourage vigorous growth, lush foliage, and an abundance of magnificent blooms.

What nutrients do hibiscus need?

Hibiscus plants, like all plants, have standard nutrient requirements to grow and thrive. Understanding its essential nutrient intake will help you create an environment that promotes the health and vitality of your hibiscus plants.

One of the primary nutrients that hibiscus plants need is nitrogen. Nitrogen is for promoting healthy growth and lush leafage.

It plays a vital role in the production of abundant green leaves, giving your hibiscus plants a vibrant and full appearance. To meet this need, consider using a balanced fertilizer with a higher nitrogen content.

Potassium is a vital nutrient that contributes to hibiscus plants’ overall strength and vitality. It improves the plant’s resistance to diseases and pests. Also, the ability to fight against environmental stress too.

Phosphorus is another essential nutrient for hibiscus plants, particularly when it comes to encouraging beautiful and plentiful blooms. Phosphorus supports the formation of flower buds and enhances the plant’s ability to produce beautiful blossoms.

Look for a fertilizer with a higher phosphorus ratio, especially during the flowering stage, to help your hibiscus plants thrive.

With these three nutrients, hibiscus plants also benefit from micronutrients iron, manganese, and zinc. These micronutrients are required in smaller quantities but play essential roles in the plant’s health.

Is Epsom Salt Good for Hibiscus Plant?

epsom salt for hibiscus plant

Yes, Epsom Salt is good for Hibiscus Plant. Its powerful components of magnesium and sulfur benefit your hibiscus plants.

The magnesium and sulfur found in Epsom salt are key players in boosting the health of your hibiscus plants. Magnesium encourages the production of chlorophyll while sulfur aids in root development, helping in strong and robust growth.

After the dormant winter months, use Epsom salt to encourage a refreshed blooming cycle. Epsom salt can help promote new growth and prepares the plants for an abundant display of colourful blooms.

Using Epsom salt as a foliar spray can work wonders for hibiscus plants. While Epsom salt offers significant benefits, it’s important to remember that it should not be the sole fertilizer for hibiscus plants. 

Epsom salt lacks other essential nutrients required for plant nutrition. To ensure your hibiscus plants receive a balanced diet, it’s recommended to use a fertilizer with a suitable NPK value, such as 17-5-24.

Benefits of Epsom Salt for Hibiscus Plant

Here are some benefits of using Epsom salt on your hibiscus plant – 

Increased Flower and its size

Magnesium, present in Epsom salt, acts as a natural booster for flower production in hibiscus plants. With an adequate supply of magnesium, Epsom salt encourages your hibiscus plants to produce more beautiful and vibrant flowers and their size too.

Improved Growth

Epsom salt contains nutrients that are magnesium and sulfur, which benefit the growth and development of hibiscus plants.

Magnesium helps in the production of chlorophyll, the green pigment that fuels plant growth, while sulfur supports healthy root development. By providing these nutrients, Epsom salt helps your hibiscus plants flourish.

Pest Control

Epsom salt can act as a natural deterrent for pests that may harm your hibiscus plants. Unwelcome visitors like spider mites and aphids can be prevented by the use of Epsom salt.

This environmentally friendly approach helps protect your hibiscus plants from potential damage caused by these pests.

Stress Reliever

Hibiscus plants can experience stress from factors such as drought or transplanting. Epsom salt can aid in relieving this stress and promoting a quick recovery.

By providing the necessary nutrients and minerals, Epsom salt supports your hibiscus plants in bouncing back and regaining their vigour and vitality.

When to Apply Epsom Salt on Hibiscus?

Applying Epsom salt to your hibiscus plants can provide numerous benefits. However, timing is the key to providing maximum effectiveness. 

Early Spring

The ideal time to begin applying Epsom salt to your hibiscus plants is in early spring when the plants are emerging from their winter dormancy.

As new growth starts to appear, this is the perfect opportunity to provide a nutrient boost with Epsom salt. It will support healthy growth and set the stage for a blooming season filled with beautiful flowers.

Pre-Blooming Stage

Another suitable time to apply Epsom salt on hibiscus plants is during the pre-blooming stage. This is when the hibiscus plants are forming flower buds and preparing for their blossoms. By applying Epsom salt at this stage, you can provide the necessary nutrients to your plant.

In addition to specific timing, you can include Epsom salt in your regular maintenance routine for hibiscus plants. This can include periodic applications throughout the growing season to provide a continuous supply of magnesium and sulfur.

How to Use Epsom Salt for Hibiscus?

Epsom salt can be a game-changer when it comes to nurturing your hibiscus plants. Take care of dosage, and don’t apply too much.

Method 1 Boosting Soil Magnesium Content

Water the Plant – Start by giving your hibiscus plant a good watering with plain water to moisten the soil.

Applying Epsom Salt to Soil – Sprinkle a small amount of Epsom salt directly onto the soil surface around the plant.

Water – Lightly water the soil to help the Epsom salt dissolve and reach the plant’s root zone.

For large hibiscus, potted plants and containers – 

For large hibiscus plants use ¼ cup of Epsom salt. You can use 1 teaspoon or 2 of Epsom salt for a pot. Whereas for containers, you can use 1 tablespoon or 2 for a container. Also, you can use Epsom salt in water to mist the plants.

(Read this: Do Hibiscus Plant Need Full Sun?)

Method 2 Foliar Spray for Magnesium Boost

  • Mix 1 teaspoon of Epsom salt with 1 litre of water to create a foliar spray.
  • Lightly mist the hibiscus plant’s leaves, ensuring coverage on both sides.
  • Apply the foliar spray once a month to support new growth and flowering.

Method 3 Enhanced Fertilizer Combination

  • In a gallon of water, combine 1 tablespoon each of balanced fertilizer (NPK 20-20-20), Epsom salt, and potassium nitrate.
  • Apply this mixture to your hibiscus plants once in the spring and again in the fall.

Method 4 Homemade Organic Liquid Fertilizer

  • Grind 4 dried banana peels, 3 eggshells, and 4 tablespoons of Epsom salt in a mixer.
  • Add 75 ml of water to the mixture and shake well to create a liquid fertilizer.
  • Water your hibiscus plant with this organic fertilizer mixture to provide a nutrient boost.

What happens if you put too much Epsom salt on Hibiscus?

Putting too much Epsom salt on your hibiscus plants can have many consequences. While Epsom salt can be beneficial in moderate amounts, adding so much can harm your plant. Here are some problems – 

1. Imbalance of Nutrients – Hibiscus plants require a balanced intake of nutrients to thrive. Overdosing on Epsom salt can disrupt this delicate balance, particularly if the soil already contains sufficient magnesium levels. Excessive magnesium can hinder the plant’s ability to absorb other essential nutrients, leading to deficiencies and stunted growth.

2. Salt Buildup in Soil – Overused Epsom salt can overly accumulate in the soil. The excessive buildup of salts can result in soil saltiness, making it difficult for hibiscus plants to take in water and nutrients effectively. This can cause root damage, wilting, and poor plant health.

3. Leaf Burn and Discoloration – Applying too much Epsom salt can cause leaf burn and discolouration. So much amount of salt can remove moisture from the leaves and leads to scorching, yellowing, or browning of leaves. This can negatively impact the plant’s photosynthesis process, reducing its energy production.

4. Flower and Bud Drop – Hibiscus plants may experience a drop in flower buds and blooms if they receive an excess of Epsom salt. The disrupted nutrient balance and the stress caused by excessive salts can hinder the plant’s ability to develop healthy flowers. 

5. Excessive Epsom salt can release soil aluminium – Adding too much Epsom salt to your hibiscus plants can result in the release of soil aluminium, which can have negative effects on plant health. Excessive aluminium can disrupt nutrient uptake and hinder growth.

To prevent these issues, follow the recommended dosage and application instructions for Epsom salt. Regular soil testing can help determine the actual nutrient requirements of your hibiscus plants.

Also Read: Are Coffee Grounds Good for Hibiscus?

Does Epsom Salt Help Flowering Hibiscus Plants?

Yes, Epsom salt help flower Hibiscus plants. It helps flowering hibiscus plants by providing essential magnesium, promoting vibrant blooms and improving nutrient absorption.

Its high magnesium content supports vibrant blooms by aiding in chlorophyll production. Additionally, it improves nutrient absorption, ensuring the plants receive the necessary nourishment for healthy flowering.

Also Read: Why My Hibiscus Plant Not Flowering?

Best Organic Substitute for Epsom Salt for Hibiscus Plants

If you’re looking for an organic alternative to Epsom salt for your hibiscus plants, here are a few options that can provide similar benefits –

1. Compost – Using compost is an excellent organic substitute for Epsom salt. Compost enriches the soil with nutrients and improves its structure, promoting healthy growth and flowering in hibiscus plants. It has a balanced mix of organic matter, minerals, and beneficial microorganisms, providing a nourishing environment for your plants.

(Check this article: Is Bone Meal Good for Hibiscus Plants?)

2. Manure – Organic manure, such as well-rotted animal manure or composted poultry manure, is another effective substitute for Epsom salt. Manure is rich in nutrients, including nitrogen, phosphorus, and potassium, that are necessary for the hibiscus plant. Ensure that the manure has properly composted to avoid burning the plant’s roots.

3. Organic Fertilizers – Look for organic fertilizers specifically formulated for flowering plants or those with a balanced NPK (nitrogen, phosphorus, and potassium) ratio. These fertilizers often contain natural ingredients like bone meal, kelp meal, and fish emulsion, providing a gentle and organic source of nutrients to support hibiscus growth and flowering.

4. Plant-based Tea – Homemade plant-based teas, such as compost tea or seaweed tea, can be brewed and applied to hibiscus plants. These teas provide a range of beneficial nutrients, trace elements, and growth-promoting compounds. They can be used as a foliar spray or added to the soil to enhance the health and blooming potential of your hibiscus plants.

When to Avoid Epsom Salt on Plants?

There are certain situations when it’s best to avoid using Epsom salt on plants. 

Soil with Sufficient Magnesium Levels – If your soil already has adequate levels of magnesium, there is no need to add Epsom salt. Excessive magnesium can disrupt the balance of nutrients in the soil and negatively impact plant health. First, check the soil and add Epsom salt if needed.

Plants Showing Signs of Nutrient Imbalance – If your plants are showing signs of nutrient deficiency or imbalance, identify the specific nutrient causing this issue. Epsom salt, which provides magnesium and sulfur, may not address the underlying problem if it’s related to other nutrients like nitrogen, phosphorus, or potassium. In such cases, it’s advisable to use a balanced fertilizer or address the specific nutrient deficiency.

As the main fertilizer – While Epsom salt provides magnesium and sulfur, it lacks other essential nutrients required for healthy plant growth. Plants need balanced nutrients, including nitrogen, phosphorus, and potassium, as well as trace elements. Relying solely on Epsom salt may result in nutrient deficiencies, leading to weak and undernourished plants.


Epsom salt can be a beneficial addition to your gardening routine, providing magnesium and sulfur to support the health and blooming of hibiscus plants. It can enhance nutrient absorption, promote vibrant blooms, and aid in stress relief. 

However, it’s important to use Epsom salt in moderate amounts and with a balanced fertilizer to ensure that all the plant’s nutritional needs are met.

Remember to consider the specific requirements of your hibiscus plants, conduct soil tests if necessary, and address any underlying issues before using Epsom salt or any other fertilizer.