GreenPlanet Nutrients PK Spike

Begin applying PK Spike from the second week of bloom and continue every two weeks throughout the flowering cycle. Stop one week before your final flush to allow the plant to clear excess phosphorus and potassium from the tissue before harvest.

The bi-weekly cadence — rather than every feeding — is intentional. PK Spike is a targeted spike supplement, not a continuous base additive, and applying it at the recommended interval delivers the P and K boost at key developmental windows without over-accumulating in the medium.

At the recommended rate of 0.5–1 ml/L, PK Spike adds up to 250 PPM to your nutrient solution. On the days you apply PK Spike, reduce your base nutrient strength by an equivalent amount to keep your total EC and PPM within your target range.

If you are following GreenPlanet's official feed chart, check whether PK Spike's contribution is already factored into the program's recommended base nutrient levels for the weeks it is applied — if so, no additional adjustment is needed.

Potassium plays a central role in regulating osmotic pressure within plant cells — the internal water pressure that determines how firm and turgid cells become. When potassium is deficient, cells lose their ability to maintain proper pressure, and developing floral structures grow loose and airy rather than tight and dense.

By delivering an elevated K load at the right point in the flowering cycle, PK Spike ensures cells have the potassium they need to maintain structural integrity as buds develop and stack — producing the firm, heavy flower clusters that K-deficient plants consistently fail to achieve.

Phosphorus is involved in three of the most energy-intensive processes during flowering: photosynthesis, ATP energy transfer, and nutrient mobility within the plant. During bud development, the plant's demand for phosphorus spikes significantly as it diverts resources toward flower site formation and the synthesis of aromatic compounds.

Without adequate phosphorus, the plant struggles to generate and move the energy required to build and fill out flowers — resulting in smaller, less developed buds regardless of how well other nutrients are dialed in. PK Spike's 14% available phosphate ensures this demand is met at critical development windows, much like the targeted phosphorus delivery found in GreenPlanet Bud Booster.

Yes — PK Spike is designed to stack with GreenPlanet's broader bloom additive lineup. Because it is applied every two weeks rather than every feeding, it functions as a periodic intensifier rather than a continuous base, making it straightforward to incorporate alongside products like Massive Bloom Formulation, Liquid Weight, or Karbo Boost without constant PPM conflicts.

On PK Spike application days, adjust your base nutrient concentration downward to account for the additional 250 PPM contribution. Refer to GreenPlanet's official feed chart for the recommended stacking sequence specific to your chosen nutrient program.

Cell wall integrity is one of the plant's primary physical defences against pathogens and pest damage. Thicker, stronger cell walls are harder for fungal organisms to penetrate and more resistant to the mechanical damage caused by sucking insects and other pests — reducing the plant's vulnerability during the late-flowering stage when immune resources are being heavily diverted toward bud development.

The potassium in PK Spike directly supports the biochemical processes that build and maintain cell wall thickness, giving your plants a structural advantage at exactly the stage when they are most exposed to opportunistic threats.