{"product_id":"emerald-harvest-cal-mag","title":"Emerald Harvest Cal-Mag Calcium Magnesium Supplement","description":"\u003ch2\u003eCover the Two Secondary Macros Your Base Feed Runs Short On\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eEmerald Harvest Cal-Mag\u003c\/strong\u003e, from California, supplies \u003cstrong\u003ecalcium and magnesium\u003c\/strong\u003e - two secondary macronutrients that do far more work than the name suggests. Calcium holds cell walls together; magnesium sits at the centre of the chlorophyll molecule. Between them they \u003cstrong\u003eassist the transport of other nutrients\u003c\/strong\u003e and \u003cstrong\u003eincrease photosynthesis rates\u003c\/strong\u003e, which is why a shortfall stalls growth even when your base feed EC looks right. Essential stuff in coco, under strong LEDs, and on RO or soft tap water.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintains optimal growth rates\u003c\/strong\u003e - keeps plants moving rather than plateauing mid-cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssists nutrient transport\u003c\/strong\u003e - calcium moves other elements through the plant properly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreases photosynthesis rates\u003c\/strong\u003e - magnesium underpins chlorophyll production\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGets the best from your boosters\u003c\/strong\u003e - supports peak flower additives so they actually deliver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdeal for RO and soft water\u003c\/strong\u003e - replaces what filtration and low-mineral supplies leave out\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePale New Growth and Feeds That Stop Working\u003c\/h3\u003e\u003cp\u003eCalcium and magnesium shortages are easy to misread. Poor nutrient uptake, interveinal yellowing on older leaves, weak roots and slow growth all get blamed on the base feed, when the plant is short of the elements that move everything else around. It bites hardest in coco and on RO water, where demand is high and supply is near zero.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoco:\u003c\/strong\u003e the highest-demand medium - run Cal-Mag with your feed from early veg through flower\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydroponics and DWC:\u003c\/strong\u003e add to the reservoir \u003cstrong\u003efirst\u003c\/strong\u003e, mix thoroughly, then add your base A and B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoil:\u003c\/strong\u003e use as required, usually only on RO water or if new growth shows deficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRate:\u003c\/strong\u003e follow the Emerald Harvest feed chart for your stage - start low and adjust by watching new growth and EC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH:\u003c\/strong\u003e set after mixing - \u003cstrong\u003e5.5-6.0\u003c\/strong\u003e in hydro and coco, \u003cstrong\u003e6.0-6.5\u003c\/strong\u003e in soil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNever\u003c\/strong\u003e mix concentrated Cal-Mag straight into silica - dilute in the tank between additions\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e calcium and magnesium supplement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplies:\u003c\/strong\u003e calcium and magnesium (secondary macronutrients)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAction:\u003c\/strong\u003e nutrient transport and photosynthesis support\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse stage:\u003c\/strong\u003e vegetative growth through peak flower\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e California, USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Emerald Harvest","offers":[{"title":"950ml","offer_id":53445686558986,"sku":null,"price":19.49,"currency_code":"GBP","in_stock":true},{"title":"3.79 Litre","offer_id":53445686591754,"sku":null,"price":54.49,"currency_code":"GBP","in_stock":true},{"title":"9.46 Litre","offer_id":53445686624522,"sku":null,"price":103.95,"currency_code":"GBP","in_stock":true},{"title":"22.71 Litre","offer_id":53445686657290,"sku":null,"price":197.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/EmeraldHarvest-Cal-Mag_1Litre.webp?v=1785289625","url":"https:\/\/hydrocropshop.co.uk\/products\/emerald-harvest-cal-mag","provider":"Hydro Crop Shop","version":"1.0","type":"link"}