Heavy 16 Fire Plant Additive

Starting At: $41.98


Increase volume and quality with Heavy Fire (1-10-16) by Heavy 16. Heavy Fire represents the ultimate hand-crafted P/K booster created through strict adherence to nutritional chemistry and biological principles. Heavy Fire is a versatile bloom stimulant that can, because of its ingredients, be incorporated into any existing plant system and nutrient program. Starting Heavy Fire in the last one to two weeks of the veg phase and going through the entire bloom cycle with a gradual ramp will provide you with pre-bloom stimulation, and, will supply intermediate and late-phase cascading delivery of phosphorous.

  • Guaranteed Analysis: 1-10-16
  • Improves plant nutrition
  • Sizes available: 8 oz to 55 gallon

More Info




Heavy 16 Fire Plant Additive

When formulating Heavy Fire, Heavy 16 chose to incorporate virgin phosphite (phosphonic acid) for the reason of its optimum availability and its key position in the cascading delivery philosophy. Along with the multiple forms of phosphate in Heavy Fire, phosphite is extremely mobile and ensures increased root development, bud formation, and stress and disease resistance. Phosphite is extremely mobile within both the xylem and phloem of the plant’s vascular system, allowing it to be rapidly incorporated into biochemical reactions. The true beauty of phosphite is that once it is rapidly absorbed in this streamlined molecular form, it is then oxidized or converted into phosphate inside the plant, equating to an internal time-released offering of phosphorous. This allows for a continual presence of phosphorus for energy transfers and other critical time-sensitive functions when the plant is naturally demanding it. As an added bonus, phosphite will actually function as a fungicide by encouraging nuclei within the plant’s cells to release natural defense molecules that attack fungal pathogens directly while also adding to the mass of the cell wall.

Running Heavy Fire in the late phase of veg will provide for a larger, more resilient root mass and create larger, more branched foliage. With a high analysis of P/K equivalents as the baseline, it uses four forms of phosphorous, including the highly effective form phosphite (PO3), as well as three forms of potassium. nitrogen is added in the ammonium form to facilitate phosphorous uptake and assimilation. Then it’s combined with a premium cold-processed kelp mix (Ascophyllum nodosum and laminaria japonica) to balance natural blooming hormone levels, bio-clays (natural silica and calcium, plus exotic minerals) to ensure natural structural integrity and quality, low-molecular-weight fulvic acid to allow for natural chelation of elements, and natural plant-derived energy boosters to increase flower formation rate and maturation.


  • Improves soil/nutrient conditions for better crop yield
  • 3 forms of available phosphorus & 3 forms of available potassium.
  • 2 types of cold-processed seaweed: Ascophyllum nodosum and laminaria japonica.

Guaranteed Analysis:


Derived from ammonium polyphosphate, potassium polyphosphate, phosphoric acid, potassium hydroxide, potassium sulfate, kelp (ascophyllum nodosum), kelp (laminaria japonica), medicago sativa (alfalfa extract)

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