Wicked Organics Magnesium Sulfate Fertilizer

When the Leaves Yellow Between the Veins — Pure Magnesium and Sulfur, Ready to Dissolve

Old Cobblers Farm Wicked Organics Magnesium Sulfate is Epsom salt in its purest garden form: magnesium sulfate heptahydrate (MgSO₄·7H₂O), a single defined compound with a guaranteed 9.8% magnesium and 12.9% sulfur. It is not an N-P-K fertilizer — it is a targeted supplement for two essential nutrients plants can't make leaves and proteins without. Magnesium sits at the center of every chlorophyll molecule, so a shortage shows up as a telltale pattern: interveinal chlorosis — yellowing between the veins of older leaves while the veins stay green. Sulfur backs the amino acids and enzymes behind healthy growth.

Key Benefits

Greens up deficient leaves — Magnesium is the core of chlorophyll — correcting a shortage restores green color and reverses the interveinal yellowing of older leaves.

Magnesium AND sulfur — Two essential nutrients at once: magnesium for photosynthesis and sulfur for the amino acids and enzymes behind healthy growth.

Works fast, applies any way — Fully water-soluble, so it dissolves for foliar sprays and drenches that act within days — or mixes dry into soil.

Made for Mg-hungry plants — The trusted fix for tomatoes, peppers, roses, and blueberries, and for the sandy, high-potassium, or rain-leached soils that lose magnesium fastest.

Pure and predictable — A single defined compound with guaranteed minimums that match the chemistry — no guesswork, no fillers.

 Organic or conventional — Suitable across organic and conventional programs as a clean, targeted nutrient source.

Because it's fully water-soluble, it works fast and flexibly: mix it into soil at startup, dissolve it for a foliar spray that greens leaves within days, drench the root zone, or run it through fertigation. It's the classic fix for magnesium-hungry favorites — tomatoes, peppers, roses, and blueberries — and for the soils that lose magnesium fastest: sandy ground, high-potassium soils, and beds leached by heavy rain. The honest caveat that keeps it credible: magnesium sulfate corrects a magnesium (or sulfur) deficiency. Where there's no deficiency, more won't help — so a soil test or the clear interveinal-yellowing symptom should guide its use.

Where to use it: vegetables (especially tomatoes and peppers), roses and flowering ornamentals, evergreens and acid lovers, fruit trees, lawns, containers and houseplants, and any magnesium- or sulfur-deficient soil — across organic and conventional programs.