{"product_id":"ionic-cal-mag-pro-by-growth-technology-calcium-magnesium-iron-supplement","title":"IONIC Cal-Mag Pro by Growth Technology | Calcium Magnesium Iron Supplement","description":"\u003ch2\u003e\u003cb\u003eIONIC Cal-Mag Pro — The Nutrient Nobody Asked For, and Everybody Needed\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp\u003eHere is a peculiar fact about growing anything, in any medium, anywhere: the two elements your plants are most likely to run short of — calcium and magnesium — are the two nobody thinks to buy. Nitrogen gets all the glory. Phosphorus and potassium get their own flashy \"Bloom Boost\" branding and a picture of a very large tomato on the label. Calcium and magnesium just quietly run out, somewhere around week four, and nobody notices until the leaves start telling on you.\u003c\/p\u003e\n\u003cp\u003eThis is, if you think about it, a problem of framing rather than chemistry. A \"Cal-Mag supplement\" sounds like an optional extra — the horticultural equivalent of undercoating on a new car. IONIC Cal-Mag Pro, made by Growth Technology, is not that. It is closer to what a good structural engineer would call load-bearing. Remove it from a coco or hydro feeding regime and the whole thing doesn't collapse dramatically — it just quietly underperforms, which is somehow worse, because nobody can quite say why.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eWhat Makes This Particular Cal-Mag Genuinely Different\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eMost Cal-Mag products are one idea wearing different labels: calcium nitrate, magnesium sulphate, done. IONIC Cal-Mag Pro is built from \u003cb\u003ethree separate calcium sources\u003c\/b\u003e, including a chelated form designed for rapid uptake — the plant equivalent of skipping the queue rather than waiting in line. Alongside the calcium (5.6%) and magnesium (4.01%), it carries \u003cb\u003echelated iron\u003c\/b\u003e, \u003cb\u003ehumic acids\u003c\/b\u003e, and \u003cb\u003eamino acids\u003c\/b\u003e — ingredients that don't just correct a deficiency but help the plant actually do something useful with the correction once it's been made.\u003c\/p\u003e\n\u003cp\u003eThis is the detail most Cal-Mag products skip, and it's the detail that matters. A calcium deficiency isn't really a shortage of calcium; it's a shortage of calcium \u003ci\u003ethe plant can use in time\u003c\/i\u003e. IONIC Cal-Mag Pro is formulated around that distinction.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e🌿 What It Actually Fixes\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eSlow, sluggish mid-season growth\u003c\/b\u003e — the unglamorous stretch between a strong start and a strong finish, where most Cal-Mag deficiencies quietly take hold.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eInterveinal yellowing\u003c\/b\u003e — the tell-tale striped look of a magnesium shortfall.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eSmall, dark, sharp-edged spots\u003c\/b\u003e on leaves — classic calcium deficiency, and a sign that's easy to miss until it isn't.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eGeneral pale, tired foliage\u003c\/b\u003e — often blamed on everything except the actual cause.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eNutrient lockout in coco\u003c\/b\u003e — coco coir binds calcium and magnesium more readily than soil or hydro, which is precisely why coco growers reach for this bottle more than anyone else.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eHow To Use It\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eTo prevent deficiencies:\u003c\/b\u003e add at 0.5ml per litre as part of your regular feed.\u003cbr\u003e\n\u003cb\u003eTo correct an existing deficiency:\u003c\/b\u003e increase to 1–2ml per litre until the plant recovers, then step back down.\u003cbr\u003e\n\u003cb\u003eGrowing in coco?\u003c\/b\u003e Pre-drench your medium with a Cal-Mag solution before potting on — mix at 1ml per litre, water the pot through until you see runoff, and plant the following day. It's a small step that prevents a much bigger one later.\u003c\/p\u003e\n\u003cp\u003eAlways shake well before use, check pH and EC after mixing, and add it to your reservoir after your base nutrients rather than in isolation — nutrients, like people, tend to behave better when introduced properly rather than all shouting at once.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eProduct Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eCalcium (Ca):\u003c\/b\u003e 5.6%\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eMagnesium (Mg):\u003c\/b\u003e 4.01%\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eIron (Fe):\u003c\/b\u003e 0.15% (chelated)\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eAlso contains:\u003c\/b\u003e amino acids, humic acids, complex organic plant extracts\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eSuitable for:\u003c\/b\u003e soil, coco, and all hydroponic systems including NFT and flood \u0026amp; drain\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cb\u003eBrand:\u003c\/b\u003e IONIC, by Growth Technology\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cblockquote\u003e\u003cp\u003e\u003cb\u003e💉 Measuring Syringe\u003c\/b\u003e available separately, for growers who'd rather measure 1ml properly than guess and hope — a surprisingly large source of feeding errors, and an entirely avoidable one.\u003c\/p\u003e\u003c\/blockquote\u003e\n\u003cp\u003eAvailable in 300ml, 1 Litre, and 5 Litres, so whether you're running a single tent or a full room, there's a bottle sized for what you're actually doing rather than what the biggest pack happened to be.\u003c\/p\u003e","brand":"Growth Technology","offers":[{"title":"300ml","offer_id":54745032393050,"sku":"BFH-IONICCALMAGPRO-300ML","price":7.99,"currency_code":"GBP","in_stock":true},{"title":"1 Litre","offer_id":54745032425818,"sku":"BFH-IONICCALMAGPRO-1L","price":21.99,"currency_code":"GBP","in_stock":true},{"title":"5 Litres","offer_id":54745032458586,"sku":"BFH-IONICCALMAGPRO-5L","price":59.99,"currency_code":"GBP","in_stock":true},{"title":"Measuring Syringe 💉","offer_id":54745032491354,"sku":"BFH-IONICCALMAGPRO-SYRNG","price":2.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/9861\/4106\/files\/rn-image_picker_lib_temp_c6818d0f-dcad-47de-9277-336c9badcc5d.png?v=1788785057","url":"https:\/\/blackflaghorticulture.com\/products\/ionic-cal-mag-pro-by-growth-technology-calcium-magnesium-iron-supplement","provider":"Black Flag Horticulture","version":"1.0","type":"link"}