Check the listing for details. CAL-MAG Plus. Condition: New. Listed at 45.00 USD. CAL-MAG 16 ounce Professional cultivators do not react to plant deficiencies after they appear, they have proactive scheduled plant inoculations using CAL-MAG Plus that provides the fundamental gateway nutrients needed as precursors to best enable N-P-K and all other nutrients to be absorbed efficiently. This prevents plant deficiencies and promotes macro nutrients effectiveness. Nitrogen (N)Calcium (Ca)Magnesium (Mg)Iron(Fe)Panax quinquefoliusThiamine B1GypsumBoronPolysulphateSulfur This formula is best used with reverse osmosis (RO) water to compensate for the natural water calcium draw in order to provide the exact formulation’s target calcium level for cannabis plants. Use once a week as a soil feed starting at second week of seedling up until the sixth week of flower. Use as a foliar spray to enhance nutrient intake and prevent deficiencies. Apply once a week starting at second week of seedling during early morning or evening when stomata are open for greatest leaf absorption. Apply to both top and bottom of leaves. Stop Foliar application in the second week of flower.