{"product_id":"cal-mag-extreme-liquid-1-gallon-fertilizer-corrects-secondary","title":"Cal-Mag Extreme Liquid 1 Gallon Fertilizer - Corrects Secondary","description":"\u003cp\u003eOur review of Cal-Mag Extreme Liquid 1 Gallon finds it best suited for gardeners who already manage primary N-P-K feeding but need a reliable secondary nutrient and trace element boost. The bottom line: this formula is designed to correct subtle but growth-limiting deficiencies in calcium, magnesium, iron and sulfur using natural chelates, and it proved effective when mixed with regular feeds or applied as a foliar spray. For growers who want an easy-to-use supplement to prevent blossom end rot and support flower quality, this product delivers clear, practical benefits.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh secondary nutrient content:\u003c\/strong\u003e Provides a concentrated source of calcium and magnesium to target deficiencies that limit growth even when N-P-K is adequate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrace element blend:\u003c\/strong\u003e Includes iron and other micro-nutrients to support chlorophyll production and overall plant vigor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural chelates:\u003c\/strong\u003e Uses chelating agents that help nutrients remain available and be transported into plant tissue for efficient uptake.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible application:\u003c\/strong\u003e Can be mixed with normal fertilizers or water, and applied to soil, growing medium, or used as a foliar spray.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy dosing:\u003c\/strong\u003e Simple mixing ratio of 1 teaspoon per gallon and safe to apply up to twice weekly for routine maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrects blossom end rot:\u003c\/strong\u003e Customers report measurable improvement in blossom end rot issues when used as directed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product is aimed at hobby and serious gardeners who already monitor macronutrients but struggle with secondary nutrient or micro-nutrient deficiencies, such as blossom end rot or poor flower development. It is useful for container gardeners, raised bed growers, and small-scale indoor setups who want a single supplement to address multiple secondary and trace elements.\u003c\/p\u003e\n\u003cp\u003eGrowers who do not track fertilizer schedules or who need a complete primary fertilizer should look elsewhere, since Cal-Mag Extreme is a targeted supplement with an N-P-K of 2-0-0 and is intended to be mixed with routine feeds rather than replace them.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConcentrated formula corrects calcium and magnesium shortages without changing primary fertilizer plans.\u003c\/li\u003e\n\u003cli\u003eTrace elements and natural chelates improve nutrient availability and uptake across different plant types.\u003c\/li\u003e\n\u003cli\u003eSimple, repeatable dosing and versatile application methods make it easy to add to weekly feeding routines.\u003c\/li\u003e\n\u003cli\u003eCustomers note good value for money and consistent longevity of the product in use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users reported a concern with dissolved quality, suggesting careful mixing and stirring before each use are necessary.\u003c\/li\u003e\n\u003cli\u003eNot a full N-P-K fertilizer, so it must be combined with a primary nutrient program for balanced feeding.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct name\u003c\/td\u003e\n\u003ctd\u003eCal-Mag Extreme Liquid 1 Gallon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary brand\u003c\/td\u003e\n\u003ctd\u003eGS Plant Foods\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eN-P-K\u003c\/td\u003e\n\u003ctd\u003e2-0-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKey nutrients\u003c\/td\u003e\n\u003ctd\u003eCalcium, Magnesium, Iron, Sulfur and trace elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eSoil, growing medium, or foliar spray\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMixing rate\u003c\/td\u003e\n\u003ctd\u003e1 teaspoon per gallon; up to twice weekly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eCal-Mag Extreme is a focused, high-concentration supplement that works best for gardeners addressing specific secondary nutrient and micro-nutrient gaps. It pairs well with a separate N-P-K program, is easy to use, and represents good value for those seeking to prevent blossom end rot and improve flower quality without overhauling their feeding schedule.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this be used as a foliar spray?\u003c\/strong\u003e\u003cbr\u003eYes. The formula is suitable for foliar application as well as soil drench when mixed at the recommended rate and stirred before use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should it be applied?\u003c\/strong\u003e\u003cbr\u003eMix 1 teaspoon per gallon and apply up to two times a week as a supplement to regular fertilizer routines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it replace my regular fertilizer?\u003c\/strong\u003e\u003cbr\u003eNo. With an N-P-K of 2-0-0 it is a secondary and micro-nutrient supplement and should be combined with a primary nutrient program for balanced feeding.\u003c\/p\u003e","brand":"GS Plant Foods","offers":[{"title":"Default Title","offer_id":48187641233627,"sku":"B09M7LF4XP","price":36.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71BAjSzZ2fL._AC_SL1500.jpg?v=1769442963","url":"https:\/\/gearmusthave.com\/products\/cal-mag-extreme-liquid-1-gallon-fertilizer-corrects-secondary","provider":"GearMustHave","version":"1.0","type":"link"}