GreenPlanet Nutrients pH Up

Because pH Up is highly concentrated, small additions have a meaningful effect on your solution's pH level. GreenPlanet recommends adding a few drops at a time, testing after each addition, and repeating until you reach your desired level — rather than adding a larger volume all at once.

Working incrementally gives you precise control and significantly reduces the risk of climbing above your target range, which would then require GreenPlanet Nutrients pH Down to correct in the opposite direction.

GreenPlanet recommends maintaining a stable pH between 5.8 and 6.4 for optimal nutrient availability. Within this range, the full spectrum of macro and micronutrients — including calcium, magnesium, iron, and phosphorus — remains soluble and accessible to plant roots.

Outside this window, even a fully stocked nutrient solution can fail to deliver results, as certain elements become chemically unavailable at pH levels that are too high or too low.

GreenPlanet recommends checking your pH daily. Nutrient solutions can drift over time as plants uptake water and nutrients at different rates, and factors like evaporation, microbial activity, and plant transpiration can all influence pH between feedings.

Always check and adjust pH after mixing a fresh nutrient solution — before it goes into your reservoir or is applied to your plants — and then monitor daily to catch any drift early.

pH Up is a base and GreenPlanet Nutrients pH Down is an acid — combining them directly causes a neutralization reaction that generates heat and can produce unpredictable compounds. Never mix the two concentrates together in undiluted form.

If you have overshot your target in either direction, add the corrective product in small increments to your already-diluted nutrient solution in the reservoir — never add one concentrate directly to the other straight from the bottle.

Different nutrients are chemically available to plant roots only within specific pH ranges. For example, iron and manganese become increasingly unavailable at higher pH levels, while calcium and magnesium can be harder for plants to absorb when pH drops too low. This is why plants can show classic deficiency symptoms — yellowing, spotting, stunted growth — even when the deficient nutrient is present in the solution at correct concentrations.

Maintaining a stable pH in the 5.8–6.4 range ensures the broadest possible window of nutrient availability, allowing your plants to access everything your feed program provides, from base nutrients to supplements like GreenPlanet Nutrients Pro Cal Supplement.

Reverse osmosis (RO) water and soft water sources tend to have naturally low pH readings — often falling below 6.0 and sometimes as low as 5.0 or under — making pH Up a routine part of mixing nutrient solutions for growers using these water types. Certain acidic nutrient additives can also pull solution pH downward after mixing, requiring upward correction before feeding.

If you consistently find yourself needing to raise pH with every mix, it is worth testing your source water's baseline pH and adjusting your mixing sequence to reduce the number of corrections needed per session.

Yes — pH management is a universal requirement across all grow media, including soil, coco coir, rockwool, and recirculating hydroponic systems. pH Up is compatible with all GreenPlanet nutrient programs, such as the organic-based GreenPlanet Nutrients 1-Part Medi One, and can be used alongside any base nutrient or additive stack without compatibility concerns.

Note that optimal pH targets can vary slightly by medium type — soil growers typically aim for the higher end of the 5.8–6.4 range, while hydroponic growers often target the lower end for maximum nutrient solubility.