Finding the best epsom salts for plants involves balancing purity, effectiveness, and ease of use. The top pick, Earthborn Elements Epsom Salt, stands out for its all-natural composition and large quantity, making it ideal for regular use. The Bloom City Liquid Epsom Salt offers a convenient liquid form that’s perfect for quick absorption, though it comes at a higher price point. The main tradeoffs in this category often involve choosing between bulk, cost-effective options and more specialized, easy-to-apply forms. Continue reading for a detailed comparison to help you select the best fit for your gardening needs.
Key Takeaways
- Bulk agricultural-grade salts tend to be the most cost-effective for large-scale or frequent use.
- Liquid formulations provide faster uptake but generally come at a higher price and may require more frequent application.
- Organic and food-grade salts are preferable for organic gardening but can be more expensive per use.
- Re-sealable packaging and measurement tools add convenience, especially for precise feeding schedules.
- Higher-priced premium options often emphasize purity and ease of application but aren’t always necessary for casual gardeners.
More Details on Our Top Picks
Epsom Salt (Magnesium Sulfate) Agricultural Grade Bulk (5 Pounds)
This bulk option from PowerGrow Systems stands out for gardeners who prefer a straightforward, no-frills magnesium sulfate solution that can be used in both soil and hydroponic setups. Compared to smaller, more convenient packages like the Earthborn Elements Epsom Salt, this 5-pound bag offers better value for large-scale gardens but sacrifices ease of application for small or beginner gardeners. Its pH-neutral, water-soluble formula ensures consistent nutrient delivery without altering soil pH, making it ideal for experienced growers managing larger plots. The limited product details on specific application rates can be a drawback for those unfamiliar with using bulk salts, potentially leading to over- or under-application. Overall, this pick is best for serious gardeners who need a reliable, cost-effective supply of pure magnesium sulfate and are comfortable measuring and mixing with water.
Pros:- Cost-effective for large quantities
- Pure, water-soluble magnesium sulfate
- pH neutral, won’t affect soil pH
Cons:- Limited guidance on application rates
- Bulk packaging may be inconvenient for small gardens
Best for: Large-scale gardeners or professional growers needing bulk magnesium sulfate for soil or hydroponics.
Not ideal for: Casual gardeners or those new to using Epsom salts, due to its bulk size and limited instructions.
- Brand:PowerGrow Systems
- Model Number:72314-1LB
- Weight:5 lbs
- Item Count:1
- Unit Count:80 ounces
- Made in:USA
Bottom line: This bulk-grade Epsom salt is best suited for experienced gardeners managing large gardens or hydroponic systems who need a reliable, economical source of magnesium sulfate.
Bloom City Liquid Epsom Salt Plant Food for All Indoor & Outdoor Plants, 32 oz
This liquid formulation from Bloom City simplifies feeding plants with magnesium and sulfur, making it a strong choice for those who want quick results without measuring dry salts. Unlike the bulk powders like PowerGrow Systems, this product offers immediate absorption and ease of use, especially for indoor plants or quick foliar feeding. Its liquid format ensures even distribution and fast uptake, but the lack of detailed application instructions or long-term effect data could leave some users uncertain about optimal frequency. This makes it ideal for busy homeowners or beginner gardeners seeking an effortless way to boost plant health. However, those requiring precise control over nutrient ratios or organic certification might find it less comprehensive than other options like ENVY Organic Magnesium Sulfate.
Pros:- Easy to mix and apply
- Supports vibrant foliage and growth
- Suitable for indoor and outdoor use
Cons:- Limited info on long-term effects
- No detailed application instructions
Best for: Home gardeners and indoor plant enthusiasts looking for a quick, easy-to-apply magnesium supplement.
Not ideal for: Experienced growers needing detailed feeding schedules or organic-certified options.
- Brand:Bloom City
- Size:32 oz
- Supports:Magnesium, Sulfur
- Use:Indoor & Outdoor Plants
- Made in:USA
Bottom line: This liquid Epsom salt is perfect for gardeners seeking a hassle-free, fast-acting magnesium supplement for indoor and outdoor plants.
Earthborn Elements Epsom Salt (1 Gallon), Resealable Bucket, Magnesium Sulfate Soaking Solution, All-Natural
This all-natural, undiluted magnesium sulfate from Earthborn Elements appeals most to those who prefer pure ingredients for soaking or gardening. Its resealable bucket makes storage and measurement straightforward, and the quick-dissolving property ensures smooth application in water. Compared to the more garden-specific formulas like Magnesium Sulfate Epsom Salt 5LB, this option emphasizes purity for soaking and personal care, which may limit its perceived effectiveness as a garden fertilizer. The lack of detailed gardening instructions or ratings could be a concern for plant-specific applications. It’s best suited for gardeners who value purity and versatility, but less so for those seeking a specialized fertilizer tailored to garden needs.
Pros:- Pure and undiluted magnesium sulfate
- Resealable bucket for convenience
- Dissolves quickly in water
Cons:- Limited info on plant-specific uses
- Primarily marketed for soaking, not as a fertilizer
Best for: Gardeners who want a pure, undiluted magnesium sulfate for soaking or multi-purpose use, including gardening.
Not ideal for: Those seeking a formulated fertilizer with precise application guidelines or organic certification for gardening.
- Volume:1 Gallon
- Type:Epsom Salt
- Features:Resealable, Food Grade, Vegan
- Dissolves Quickly:Yes
- Made in:USA
Bottom line: This product is ideal for users seeking a pure, versatile magnesium sulfate for both soaking and gardening, though it lacks specific application guidance for plants.
Magnesium Sulfate Epsom Salt 5LB – Made in USA – OMRI Listed – Plant Fertilizer for Hydroponics and Gardens
This 5-pound bag from a US-based manufacturer is tailored for serious gardeners who want a high-purity, OMRI-listed fertilizer suitable for organic gardening. Its precise composition of 10% magnesium and 13% sulfur makes it more targeted than some bulk options like PowerGrow Systems. Compared with organic options like ENVY Organic Magnesium Sulfate, this product emphasizes purity and versatility across hydroponics, soil, and container gardening. Its need for careful measurement is a tradeoff for the high-quality ingredients, which could be a challenge for beginners. Overall, this product makes sense for those with experience seeking a dependable, organic-compliant magnesium sulfate for multiple gardening methods.
Pros:- High purity, OMRI listed
- Suitable for multiple gardening methods
- Resealable packaging for storage
Cons:- Requires careful measurement for best results
- May not be ideal for beginners unfamiliar with dosing
Best for: Experienced organic gardeners or hydroponic growers needing a high-purity, OMRI-listed magnesium sulfate.
Not ideal for: Novice gardeners or those seeking organic certification without OMRI listing, due to the need for precise measurement.
- Weight:5 lbs
- Country of Origin:USA
- Ingredients:10% Magnesium, 13% Sulfur
Bottom line: This OMRI-listed magnesium sulfate is perfect for organic gardeners and hydroponic growers who need a high-quality, versatile fertilizer with precise control.
ENVY Organic Magnesium Sulfate Plant Food – Water Soluble Epsom Salts (3 Pound)
Designed for eco-conscious gardeners, ENVY Organic Magnesium Sulfate offers a 100% organic, water-soluble formula that supports lush foliage in a variety of plants including roses and vegetables. Its inclusion of a measuring scoop and resealable pouch enhances ease of use, especially for those who prefer organic solutions over synthetic ones like Bloom City. The product’s focus on safety, with no risk of nutrient burn, makes it suitable for delicate plants and beginner gardeners. However, it only provides magnesium and sulfur, lacking additional nutrients found in more comprehensive fertilizers. This pick is best for gardeners who prioritize organic inputs and simple application methods, but less so for those needing a complete fertilizer or organic certification for commercial use.
Pros:- 100% organic and water-soluble
- Includes a measuring scoop and resealable pouch
- Safe for all plant types and prevents nutrient burn
Cons:- Limited to magnesium and sulfur only
- Requires water solubility for application
Best for: Organic gardeners and hobbyists seeking a safe, easy-to-use magnesium supplement for a variety of garden plants.
Not ideal for: Gardeners needing a complete fertilizer with multiple nutrients or certified organic for commercial production.
- Brand:ENVY
- Manufacturer:National Liquid Fertilizer
- UPC:711030102625
- Unit Count:48 Ounces
- Part Number:MS30
- Included Components:ENVY Magnesium Sulfate 3 lb Pack
Bottom line: This organic magnesium sulfate is ideal for gardeners seeking a safe, simple, and eco-friendly supplement with minimal fuss.
EZ-GRO Epsom Salt for Gardening, 32 oz (Quart) – Professional Grade Magnesium Sulfate for Plants
This professional-grade magnesium sulfate stands out for its quick action and high purity, making it ideal for both soil and foliar use. Compared to the larger bulk options like the Epsoak 19 lb bag, EZ-GRO offers a convenient size for regular garden maintenance without waste. Its formulation is designed to promote lush greenery and abundant flowering, though it requires proper mixing and potentially frequent reapplication for sustained results. This makes it perfect for serious gardeners who want reliable, fast-acting plant support, but less suitable for casual hobbyists due to its application precision. Enhanced with professional-grade quality, it provides a measurable boost to plant health, especially where magnesium deficiency is evident. However, the need for correct application could be a drawback for beginners.
Pros:- Fast-acting magnesium supplement for quick results
- Professional-grade formula used by growers
- Enhances plant greenness, flowering, and growth
- Easy to mix and apply
Cons:- Requires proper mixing and application for best results
- May need frequent reapplication depending on plant needs
Best for: Gardeners seeking a quick, reliable magnesium supplement for outdoor plants and flowering shrubs.
Not ideal for: Indoor plant owners or casual gardeners who prefer bulk, long-term solutions or are less experienced with application techniques.
- Weight:32 oz (Quart)
- Type:Epsom Salt
- Form:Liquid
- Ingredients:Magnesium Sulfate
Bottom line: This pick is best suited for dedicated gardeners who want a precise, professional-grade solution to magnesium deficiency in their outdoor plants.
Epsoak Epsom Salt 19 lb. Magnesium Sulfate USP, Unscented, Resealable Bag
This bulk 19-pound bag offers a cost-effective way to support ongoing plant health, especially for those managing multiple outdoor beds or large gardens. Compared with the smaller, more targeted options like the Pure Original Ingredients 1-pound pack, the Epsoak is ideal for frequent, extensive applications, though its bulk size may be overkill for casual or indoor gardeners. The medium grain size dissolves quickly, making it easy to use in watering cans or as a soil amendment. Its USP certification assures high purity—important for those who prioritize quality over scent or additives. The primary tradeoff: the large size may lead to unused product if your needs are modest, and it lacks specific application instructions, which could be confusing for beginners. This is best for seasoned gardeners who need bulk quantities for outdoor use, but less suitable for occasional or indoor gardeners.
Pros:- Large 19 lb resealable bag for cost savings
- Quick-dissolving medium grains for easy application
- Made in the USA and cruelty-free certified
- High purity USP grade
Cons:- Bulk size may be excessive for occasional users
- No added fragrance or scent for aromatherapy
Best for: Outdoor gardeners managing large areas who need a reliable, economical magnesium sulfate supply.
Not ideal for: Indoor plant owners or occasional users who prefer smaller, more manageable quantities or scented products.
- Weight:19 lbs
- Type:Magnesium Sulfate USP
- Scent:Unscented
- Grain Size:Medium
- Made in:USA
- Certifications:Cruelty-Free
Bottom line: This bulk option is best suited for serious outdoor gardeners needing large quantities at a good price, but less ideal for casual or indoor use.
Pure Original Ingredients Epsom Salt – Magnesium Sulfate, Food Grade, 1 Pound
This 1-pound food-grade magnesium sulfate is highly versatile, suitable for soaking, cleaning, and DIY projects. It’s a good choice for gardeners who want a pure, additive-free product that can be used for plant care as well as household tasks like bath bombs or exfoliating scrubs. Compared to larger garden-specific options, its small size limits long-term gardening use, but it’s perfect for those who prefer a multi-use product or are just starting out with plant supplementation. The lack of specific instructions might be a drawback for those unfamiliar with its application, but its high purity ensures safety and quality. This is a best fit for small-scale gardeners and DIY enthusiasts who value purity and multi-functionality over bulk quantity.
Pros:- Pure, additive-free ingredients
- Versatile for soaking, cleaning, and DIY projects
- Food grade quality ensures safety
- Ideal for small quantities and experiments
Cons:- Limited to 1-pound size, less practical for large gardens
- No detailed usage instructions provided
Best for: Small-scale gardeners or DIY hobbyists who want a pure, multi-use magnesium sulfate for both garden and household projects.
Not ideal for: Large-scale outdoor gardeners or those seeking bulk supplies for frequent application, due to its limited size.
- Weight:1 Pound
- Grade:Food Grade
- Main Ingredient:Magnesium Sulfate
Bottom line: This product is best for small-scale users who want a versatile, high-purity magnesium sulfate for both gardening and household applications.
Epsoak Epsom Salt 18 lb. Agricultural Grade Magnesium Sulfate
This agricultural-grade magnesium sulfate is tailored for outdoor use, supporting healthy soils, vibrant plant colors, and robust root systems. Compared with the professional-grade EZ-GRO, it’s more suited for large-scale outdoor applications like lawn and garden beds, with the added benefit of a resealable 18 lb bag for repeated use. However, it’s less precise for indoor or delicate plants, as it’s designed specifically for outdoor environments and may lack detailed application guidance. Its bulk size makes it less practical for small gardens or indoor plant care, but it offers excellent value for outdoor enthusiasts. This product is best for experienced outdoor gardeners looking for a cost-effective soil supplement, not for indoor or small-scale applications.
Pros:- Supports healthy plant growth and soil balance
- Versatile for soil, foliar spray, and planting
- Large resealable bag for ongoing use
- Made in the USA
Cons:- Designed specifically for outdoor use, not indoor plants
- Bulk size may be excessive for small gardens
- No specific application instructions provided
Best for: Outdoor gardeners managing lawns, garden beds, or large planting areas needing a reliable soil supplement.
Not ideal for: Indoor plant owners or gardeners with small or delicate plants, as it’s optimized for outdoor use.
- Weight:18 lbs
- Grade:Agricultural
- Made in:USA
- Usage:Soil, foliar spray, planting
Bottom line: This outdoor-ready magnesium sulfate is ideal for experienced gardeners needing a bulk, versatile soil supplement, but less suited for indoor or small-scale use.
Monterey Epsom Salts Magnesium Sulfate with Measuring Spoon – 4 lbs
This 4-pound package includes a handy measuring spoon, making it an excellent choice for gardeners who prefer precise application and manageable quantities. Compared to bulk options like the Epsoak or the agricultural-grade salts, Monterey’s product offers a convenient size for small gardens or individual plants. It promotes healthy growth, blooms, and nutrient absorption, but multiple applications are often necessary for sustained results, which could be inconvenient for some. Its versatility with both foliar and soil treatment makes it a good all-rounder, though the limited weight may require frequent restocking for extensive gardens. This product makes the most sense for dedicated hobbyists or small garden owners seeking ease of use, but may be less suitable for large-scale operations.
Pros:- Promotes healthy growth and vibrant blooms
- Includes measuring spoon for accuracy
- Versatile for soil and foliar use
- Easy to handle and store
Cons:- Requires multiple applications for ongoing effects
- Limited weight may necessitate frequent reordering
Best for: Small-scale gardeners who want a precise, easy-to-use magnesium sulfate with measuring tools.
Not ideal for: Large garden setups or outdoor farms that need bulk supplies for frequent, extensive applications.
- Weight:4 lbs
- Included Components:Measuring Spoon
- UPC:022179107151
- Item Details:1 item
Bottom line: This pick is best for small garden enthusiasts who value precise dosing and easy handling, but less practical for large gardens or extensive use.
Dr Teal’s Epsom Salt Magnesium Soak, Fragrance Free, 4 lbs
While Dr Teal’s Epsom Salt is primarily marketed for relaxing baths, its high-quality magnesium sulfate makes it a surprisingly effective option for plant care, especially in gentle foliar or soil applications. Compared with agricultural-grade options like the Epsom Salt (Magnesium Sulfate) Agricultural Grade Bulk, this product offers a finer, faster-dissolving crystal that ensures easier mixing and less residue, which benefits home gardeners with delicate or sensitive plants. The fragrance-free formulation is gentle and reduces the risk of chemical buildup, but it also limits its use to just soil and foliar treatments—it’s not suitable for hydroponic systems or direct watering routines that require more concentrated solutions. This choice excels for those seeking a non-chemical, soothing option that minimizes stress on plants, especially in environments where fragrance or additives might be a concern. However, it’s not ideal for commercial growers needing large quantities or for those looking for a fertilizer product with added nutrients.
Pros:- Exceptional for soothing plants and reducing stress, similar to its calming effects on humans
- Fragrance-free and gentle, reducing risk of chemical buildup on delicate plants
- Fast dissolving crystal simplifies mixing and application
Cons:- Limited to bath and gentle soil applications, not designed for high-concentration plant fertilization
- Only available in fragrance-free option, which might be less appealing for some users seeking added benefits
Best for: Home gardeners wanting a gentle, easy-to-dissolve magnesium supplement for soil or foliar feeding, especially in sensitive plant environments.
Not ideal for: Commercial growers or hydroponic setups requiring concentrated or nutrient-enriched formulas, since this is primarily a soothing bath product with limited application scope.
- Weight:4 lbs
- Fragrance:Fragrance-Free
- Main Ingredient:Magnesium Sulfate
- Dissolution:Fast dissolving
Bottom line: This pick makes the most sense for gardeners seeking a mild, easily soluble magnesium sulfate supplement for stress relief and gentle plant care, rather than intensive fertilization.
How We Picked
Products were evaluated based on purity, grade, usability, packaging, and value. Priority was given to salts that are food-grade or agricultural-grade, ensuring safe and effective nutrient delivery. Ease of use, such as liquid versus granular forms, influenced the ranking, along with packaging that supports convenient storage and measurement. Cost-effectiveness was considered, especially for gardeners planning regular applications or larger gardens. The final ranking balances these factors, highlighting options that offer reliable performance without unnecessary expense.Factors to Consider When Choosing Best Epsom Salts For Plants
Choosing the best epsom salts for plants involves understanding how different formulations and qualities impact your garden’s health. Not all salts are created equal, and factors like purity, grade, and application method can significantly influence results. A careful selection ensures you give your plants the magnesium sulfate they need without introducing unwanted contaminants or overspending. Keep these key factors in mind as you compare options.Grade and Purity
Opt for food-grade or agricultural-grade epsom salts to guarantee safety and effectiveness. Food-grade salts are processed to meet high purity standards and are suitable for edible plants, while agricultural-grade salts are designed for larger-scale plant applications. Cheaper, lower-grade options may contain impurities that could harm sensitive plants or introduce unwanted chemicals into your garden. Always check the label for grade information to avoid surprises.
Form and Application Method
Granular salts are versatile and cost-effective for soil mixing or foliar feeding, suitable for gardeners who prefer DIY applications. Liquid formulations, on the other hand, deliver nutrients quickly and are easier to dose for targeted feeding, ideal for busy gardeners or those needing rapid results. Consider your gardening style and the plants’ needs—some prefer a slow-release approach, while others benefit from immediate magnesium absorption.
Packaging and Convenience
Re-sealable bags, measuring spoons, and pre-measured containers make application more straightforward and reduce waste. Larger bulk packages offer better value but may be less convenient if you only need small amounts. Conversely, smaller containers are ideal for occasional use or trial purposes but tend to be more expensive per weight. Think about your storage space and frequency of use when selecting packaging.
Cost and Value
Balancing price with quality is key. Bulk, agricultural-grade salts tend to be the most economical for extensive use. Premium options with higher purity and organic certifications often cost more but can be worth it for organic growers or health-conscious gardeners. Be wary of overly cheap salts that may contain fillers or impurities, which could diminish their effectiveness or harm plants over time.
Additional Features
Look for added features such as measuring tools, eco-friendly packaging, or organic certifications. These enhance usability and align with specific gardening philosophies. However, don’t pay extra for features that won’t be used—prioritize what genuinely supports your gardening goals, like ease of application or safety for edible plants.
Frequently Asked Questions
Can I use Epsom salts on all types of plants?
Most plants can benefit from Epsom salts, especially those that show magnesium deficiency symptoms like yellowing leaves or poor growth. However, not all plants require additional magnesium, and excess can sometimes cause imbalances. It’s best to test your soil first or observe your plants’ health before applying Epsom salts. For sensitive or specialized plants, consult specific care guides to avoid over-fertilization.
How often should I apply Epsom salts to my plants?
Application frequency varies depending on plant type and soil conditions, but a common recommendation is once a month during the growing season. Some plants, like tomatoes and roses, may benefit from more frequent feedings, while others need less. Overuse can lead to magnesium buildup, so monitoring plant response and soil levels is advisable. Always follow the manufacturer’s instructions or consult gardening resources for specific guidance.
Is liquid Epsom salt better than granular for plants?
Liquid Epsom salts are absorbed more rapidly, making them suitable for quick correction of deficiencies or foliar feeding. Granular salts, however, are more economical for soil application and provide a slow-release nutrient source. The choice depends on your gardening style and urgency—liquids work well for immediate needs, while granules suit ongoing maintenance. Combining both methods can also be effective for comprehensive feeding.
Are organic Epsom salts different from regular ones?
Organic or organic-certified Epsom salts are processed without synthetic chemicals, making them preferable for organic gardening. They typically come in higher purity forms and are free from contaminants that might be present in conventional salts. While they may cost more, many gardeners find value in their purity and suitability for edible plants. Always check labels to confirm organic certification if that’s a priority for you.
Can I use Epsom salts as a foliar spray?
Yes, Epsom salts are often used as a foliar feed by dissolving in water and spraying directly onto plant leaves. This method provides quick magnesium absorption and can help address deficiencies rapidly. However, avoid spraying during the hottest part of the day to prevent leaf scorch, and ensure thorough coverage. Regular foliar feeding can complement soil applications but shouldn’t replace them entirely, especially for long-term health.
Conclusion
For gardeners seeking overall reliability, Earthborn Elements Epsom Salt offers excellent purity and value, making it the best overall choice. Those on a budget or with large gardens might prefer bulk agricultural-grade options like the Epsoak Epsom Salt 18 lb. for cost-effective application. Beginners will find liquid formulations, such as Bloom City Liquid Epsom Salt, easier to use consistently. Organic growers and health-conscious gardeners should consider certified organic options like ENVY Organic Magnesium Sulfate. For those prioritizing premium features and convenience, specialized products with pre-measured packages or added tools are worth the extra expense.
