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Home >> Plants >> Gardening Tips >> Epsom Salt for Plants and Garden

Epsom Salt for Onions

Last Updated: November 14, 2023 by Gemma Barrett

Reviewed by Ivy Fleming - Fact checked by Lauren Hull

There are several variations of the common onion. White, yellow, and red onions are famous, as are long, thin spring onions. Discover how to use Epsom salt for onions for your best harvest yet.

The onion bulb is a complex, specialized leaf structure. A narrow network of roots forms the bulb’s base. The onion bulb may partially protrude above the ground as the plant develops. The leaves of onions are often hollow, tubular, and blue-green.

Because of their chemical makeup, onions are harmful to pets and must be grown carefully. Onions are planted in the spring and develop slowly. Learning to use Epsom salt for onion plants increases their output. It enhances its flavor without the use of costly and dangerous commercial sprays.

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Table Of Contents
  1. Using Epsom Salt for My Onion Plants
    • Is Epsom Salt Good for My Onions?
    • Using Epsom Salt for My Onions as a Soil Soak
    • How I Use Epsom Salt for My Onions
    • Other Benefits of Combining Epsom Salt and My Onions

Using Epsom Salt for My Onion Plants

Is Epsom salt good for onions? Epsom bath salts are made of magnesium sulfate and have much to offer your developing onions throughout the growing season. As interest in natural fertilizers like egg shells grows, many growers ask, “Is Epsom salt good for onions?”

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There are many benefits when you use Epsom salt for onions, from improved plant growth to increased disease resistance. Though they seem an unlikely candidate, Epsom salts provide plant nutrition and aid in seed germination and development.

Fresh onion is delicious, and growing your own red, white, or spring onion crop assures you an abundant supply. Explore techniques to use Epsom salt for your onion plants and enhance your practice for larger, tastier onions.

Is Epsom Salt Good for My Onions?

Gardeners want to know, “Is Epsom salt good for onion plants?” Though they’re typically enjoyed as a bath salt, you can make a natural fertilizer for onion plants with Epsom salts, they’re one of the best fertilizer choices for red onion bulbs.

The tiny magnesium sulfate crystals in Epsom salts offer important nutrition to your onions without altering garden soil pH. Tests conducted by the National Gardening Association show Epsom salts increase plant height and enhance flavor.

Using Epsom Salt for My Onions as a Soil Soak

A soil soak is ideal for anything from red to green onion plants. Veggies and pepper plants need Epsom salt for additional nutrients. Soil soaks are poured into the soil, and the onion plant’s roots uptake the magnesium sulfate and circulate it throughout the entire plant. Soil soaks are beneficial as they’re easy to apply and mitigate the risk of missing sections of the plant with topical treatments.

Combine a heaped tablespoon of undyed, scent-free Epsom salts with a gallon of cool water. Stir until blended and pour over your onion plants instead of regular watering.

How I Use Epsom Salt for My Onions

Administer a foliar spray directly onto the leaf for the prompt delivery of nutrients where they’re most needed. Mix an uncomplicated foliar spray for your onion plants using unscented, colored Epsom salts and water.

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Foliar Spray for Onion Plants

  • 2 tbsp colorless, scent-free Epsom salts
  • 2 gallons lukewarm water
  • Garden sprayer
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Shake the water and salt in the sprayer until it’s completely dissolved, and spritz the protruding leaves of your onions. Cover all leaf surfaces.

In a higher concentration this spray can also be used as a weed killer and pest deterrent. Follow our guide to make a 2 ingredient homemade weed killer with just Epsom salts and water.

Other Benefits of Combining Epsom Salt and My Onions

Epsom salt is an excellent tool for veggies, from an onion to a tomato plant. Magnesium sulfate won’t upset the pH of acidic soil or alkaline soil and efficiently delivers a nutrient boost. Many insect and fungal invasions are treatable with an Epsom salt foliar spray or soil soak.

Use unscented Epsom salts for issues like blossom end rot, powdery mildew, slugs, and more. While Epsom salts are fantastic to apply to your growing onions after a soil test shows magnesium deficiency, it’s best combined with a balanced fertilizer.

Use Epsom salt for onion plants and avoid chemical products like Miracle Grow. Whether growing onion plants for eating or as a cover crop, Epsom salts keep your onion set healthy, promote bigger onions, and keep chemicals out of your gardening.

Choose a remedy to suit your preferences and craft a simple Epsom salt fertilizer to ensure you get the most from your onion crops.

If you need fertilizer to improve your garden soil, skip Miracle Grow and use Epsom salt for growing onions. Epsom salt contains magnesium sulfate that increases the growth and production of your onion plant. Enjoy more fresh onion using Epsom salts. #epsom #salt #onions
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If you loved this concise article on using Epsom salt for onions, please share this knowledge with your friends and family who wonder, “Is Epsom salt good for onions?” on Pinterest and Facebook.

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