X Nutrients Grow Base Nutrient, 1 Quart | 1.6-2.1-5.5 NPK

What an X Nutrients Grow Quart Delivers

Half a system arrives in this bottle, and that is not a criticism so much as the design. Grow carries the macro elements a plant needs through vegetative growth at a guaranteed 1.6-2.1-5.5, alongside boron, manganese, molybdenum, zinc and copper. Calcium and iron are deliberately left out. They live in the companion Micro bottle, and the two are meant to run together rather than apart. The formula is pH buffered, which is the part worth paying for. Set the tank where you want it and the buffers hold it there rather than letting it drift overnight. X Nutrients put the useful window between 5.5 and 6.5. The base is inorganic and the line carries no OMRI listing. A quart weighs 3.0 lb and holds 946 mL, which works out near 63 gallons of finished solution at the general rate. It is made in California from raw materials the manufacturer sources in the United States.

Working a Grow Nutrient Bottle Into a Feed Schedule

The general rate is 15 mL a gallon. That number holds whether the tank feeds a recirculating system or a row of coco pots. For anything more considered than that, X Nutrients publish a week-by-week schedule and the figures move with the stage rather than sitting flat. The mixing sequence is not optional. It goes into the reservoir on its own, never premixed with another concentrate in a jug first. Set pH once every product is already in the water. In soil and coco the feed goes on at every watering rather than alternating with plain water. On a recirculating system the reservoir gets drained and refilled every one to two weeks, sooner on big plants that drink hard. Discard whatever is mixed and unused. The honest limit is the one stated at the top. Run Grow on its own and the plants go short of calcium and iron inside a few weeks. By the time that shows on a leaf it will look like something else entirely.

Key Features

• Guaranteed analysis: 1.6-2.1-5.5, covering the macro elements through vegetative growth
• Micronutrients: Boron, manganese, molybdenum, zinc and copper are all in the bottle
• Not included: Calcium and iron, which come from the companion Micro bottle
• pH buffered: Built-in buffers hold the tank where you set it, ideally 5.5 to 6.5
• General rate: 15 mL per gallon, with a week-by-week schedule published separately
• Bottle volume: 946 mL, about 63 gallons of finished feed, 3.0 lb on the shelf
• Media: Hydroponic reservoirs, soil and coco all take the same rate
• Origin: Made in California from raw materials sourced in the United States

Technical Specifications