{"product_id":"isn-nutrients-cal-mag-premium-calcium-magnesium-iron-fortifier","title":"ISN Nutrients - Cal Mag – Premium Calcium, Magnesium \u0026 Iron Fortifier","description":"\u003csection\u003e\n  \u003ch3\u003eISN Nutrients - Cal Mag – Premium Calcium, Magnesium \u0026amp; Iron Fortifier\u003c\/h3\u003e\n  \u003cp\u003eISN Cal Mag is a professional-grade mineral supplement engineered to provide optimum levels of Calcium, Magnesium, and Iron, alongside a specialised suite of essential trace elements. Designed to prevent and correct common deficiency symptoms, this premium additive serves as a vital insurance policy for high-performance crops, particularly those grown in coco coir or under high-intensity lighting. ISN Cal Mag strengthens the plant from the inside out, reinforcing cellular structures to improve \"plant hardness\" and building a robust vascular system for efficient nutrient transport. Beyond nutrition, it acts as a biological buffer, protecting plants against excessive nutrient build-up and increasing systemic resistance to environmental stressors. By ensuring these critical elements are always bioavailable, ISN Cal Mag drives the development of thick, vibrant green foliage and prevents the loss of young flowers and fruit.\u003c\/p\u003e\n  \n  \u003chr\u003e\n  \n  \u003cp\u003e\u003cstrong\u003eBest For:\u003c\/strong\u003e Preventing leaf yellowing and curling, stopping the drop of young flowers and fruit, correcting Iron and Magnesium deficiencies, and buffering coco coir against calcium lockout.\u003c\/p\u003e\n  \n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTriple-Action Mineral Blend:\u003c\/strong\u003e Delivers a balanced ratio of Calcium, Magnesium, and Iron to support chlorophyll production, enzyme activation, and structural integrity.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStructural Reinforcement:\u003c\/strong\u003e Stimulates aggressive root growth and increases \"plant hardness,\" creating sturdier stems capable of supporting heavy, high-yielding buds.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eYield Protection:\u003c\/strong\u003e Actively prevents the premature loss of flowers and young fruit, ensuring your plants maintain their maximum reproductive potential throughout the bloom cycle.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDeficiency Shield:\u003c\/strong\u003e Eliminates common growth stalls such as distorted leaf growth, interveinal chlorosis (yellowing), and deformed fruit development.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEnvironmental Resilience:\u003c\/strong\u003e Fortifies cellular walls, allowing plants to remain vibrant and productive even when faced with temperature fluctuations or nutrient-heavy feeding programmes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e ISN Nutrients (International Super Nutrients)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Concentrated Cal-Mag \u0026amp; Trace Element Supplement\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKey Ingredients:\u003c\/strong\u003e Calcium, Magnesium, Iron, and Essential Trace Elements\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eApplication Phase:\u003c\/strong\u003e Full Cycle (Vegetative and Flowering Stages)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCompatible Media:\u003c\/strong\u003e Coco Coir, Hydroponics, Rockwool, and Soil\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e 1 Litre and 5 Litre\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eIdeal For (Uses)\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCoco Coir Conditioning:\u003c\/strong\u003e Essential for growers using coco-based substrates to satisfy the media’s natural cation exchange demand and prevent Calcium lockout.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh-Intensity LED\/HID Growing:\u003c\/strong\u003e Perfect for plants under powerful lighting that require elevated levels of Magnesium and Iron to maintain high photosynthetic rates.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFoliage \u0026amp; Bud Strengthening:\u003c\/strong\u003e Use as a regular additive to ensure leaves remain thick and dark green, providing the energy needed for dense floral development.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"Holland Forge","offers":[{"title":"1L","offer_id":48388882825316,"sku":"4366","price":23.9,"currency_code":"AUD","in_stock":true},{"title":"5L","offer_id":48388882858084,"sku":"4588","price":75.9,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0713\/6487\/0244\/files\/ISN-Rejuvenator-Premium-Cal-Mag_500x_f50bc91f-8fd4-437a-8128-d6086fb40504.webp?v=1778240976","url":"https:\/\/www.greenhousepolytunnels.com.au\/products\/isn-nutrients-cal-mag-premium-calcium-magnesium-iron-fortifier","provider":"Greenhouse \u0026 Polytunnels","version":"1.0","type":"link"}