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Old Cobblers Farm™ Wicked Organics Magnesium Sulfate
How to use magnesium sulfate (Epsom salt) for greener plants and better yields. Foliar spray and soil application rates for organic gardens.
Old Cobblers Farm™ Wicked Organics Magnesium Sulfate
Magnesium sulfate is a naturally occurring mineral compound with the chemical formula MgSO4. In its hydrated form (Epsom salt), it contains approximately 10% magnesium and 13% sulfur by weight. It is one of the most water-soluble magnesium sources available, which makes it ideal for both soil application and foliar feeding.
Magnesium plays a central role in photosynthesis as the core element of the chlorophyll molecule. Without adequate magnesium, plants cannot efficiently convert sunlight into energy, leading to reduced growth and pale foliage. Sulfur supports amino acid and protein production, influences flavor in crops like onions and garlic, and helps plants access other nutrients.
Unlike many fertilizers, magnesium sulfate does not significantly alter soil pH, making it safe to use across a wide range of soil types. It is especially beneficial on sandy or acidic soils where magnesium leaches easily.
NPK
N/A
Type
Organic
Derived From
Naturally mined magnesium sulfate heptahydrate (MgSO4·7H2O), commonly known as Epsom salt
Best For
Tomatoes|Peppers|Roses|Potatoes|Blueberries|Evergreens|Lawns|Herbs
Brand
Wicked Organics
NPK Breakdown
N
0
N/A — Magnesium sulfate contains no nitrogen.
P
0
N/A — Magnesium sulfate contains no phosphorus.
K
0
N/A — Magnesium sulfate contains no potassium. However, it provides approximately 10% magnesium and 13% sulfur — two essential secondary nutrients.
What Is It ?
Magnesium sulfate — commonly known as Epsom salt — is a fast-acting, water-soluble source of two essential secondary nutrients: magnesium (10%) and sulfur (13%). While it carries an NPK of 0-0-0, its role in plant health is critical. Magnesium is the central atom in chlorophyll, the molecule that drives photosynthesis, and sulfur is essential for protein synthesis and enzyme function.
When plants are deficient in magnesium, leaves yellow between the veins (interveinal chlorosis), starting with older foliage. Sulfur deficiency shows as uniform yellowing of new growth. Magnesium sulfate corrects both deficiencies rapidly because it dissolves completely in water and is immediately available to plant roots or through foliar absorption.
Old Cobblers Farm™ Wicked Organics Magnesium Sulfate is food-grade quality and approved for organic production. Use it as a soil drench, foliar spray, or dry broadcast to keep your plants green, productive, and photosynthesizing at peak efficiency.
When To Apply ?
For foliar spray, dissolve 1-2 tablespoons per gallon of water and spray directly onto foliage, covering both upper and lower leaf surfaces. Apply in early morning or evening to avoid leaf burn. For soil application, broadcast 1-2 lbs per 100 sq ft and water in. For individual plants, dissolve 1 tablespoon in a gallon of water and drench the root zone. For transplanting, add 1 tablespoon to the planting hole.
How to Apply ?
1.
Identify Deficiency
Identify magnesium deficiency symptoms: interveinal yellowing on older leaves (veins stay green, tissue between yellows).
2.
Dissolve
Dissolve magnesium sulfate in water for foliar spray or soil drench application.
3.
Foliar Spray
Apply as a foliar spray in early morning or evening to avoid leaf scorch from midday sun.
4.
Dry Application
For dry application, broadcast granules evenly and water in thoroughly to dissolve.
5.
Reapply
Repeat every 4–6 weeks during the growing season until deficiency symptoms resolve.
6.
7
Foliar Spray
Apply as a foliar spray in early morning or evening to avoid leaf scorch from midday sun.
How To Store
Magnesium sulfate is non-toxic and food-grade safe. No special protective equipment is required, though gloves are recommended for extended handling. Store in a dry location — Epsom salt absorbs moisture readily and can clump if exposed to humidity. Keep in a sealed container.
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