HEAVY 16 Fire, 16 oz

A Phosphorus-Potassium Bloom Booster Built From Multiple Nutrient Forms, 16 Ounce

A single phosphorus source can only stay available to the plant across so wide a range of pH and root-zone conditions, which is why a bloom booster built on one salt form often loses potency as conditions shift through flowering. HEAVY 16 Fire combines three forms of phosphorus, including phosphite (PO3), with three forms of potassium and a kelp blend of Ascophyllum nodosum and Laminaria japonica, layered onto an existing nutrient program starting in late vegetative growth.

This 16 ounce bottle is a trial-size fit for a hobbyist grower or a single small tent and is metered onto an existing base feed with a gradual ramp through the bloom cycle.

Key Features & Benefits

• Three forms of phosphorus — includes phosphite (PO3) for added availability
• Three forms of potassium — supports a complete bloom-stage nutrient profile
• Kelp blend included — Ascophyllum nodosum and Laminaria japonica support natural blooming
• Ammonium-form nitrogen — helps facilitate phosphorus uptake and assimilation
• 16 Ounce size — a trial-size fit for a hobbyist grower or a single small tent

Who Should Use HEAVY 16 Fire

Growers who want a bloom-stage phosphorus and potassium booster that layers onto an existing nutrient program, starting in the last weeks of vegetative growth and continuing through bloom, will benefit from adding HEAVY 16 Fire.

About HEAVY 16

HEAVY 16 was formulated by Bryce Patterson, a Cal Poly-trained horticulturist based in Signal Hill, California, around three principles: high-grade raw ingredients, complex chemistry that simplifies application, and micro-batch blending for consistency. The line is built as a streamlined system — Bud A/B and Veg A/B base nutrients (both built with four calcium forms), plus Prime, Fire, Finish, Roots, and Foliar — designed to work across soil, coco, and hydroponic systems without a long list of separate additives.

Frequently Asked Questions

When should I start using HEAVY 16 Fire?

Fire is typically introduced in the last one to two weeks of the vegetative stage and continued through the entire bloom cycle with a gradual ramp in concentration. That timing supplies pre-bloom support followed by intermediate and late-phase phosphorus delivery.

What forms of phosphorus and potassium does Fire use?

Fire combines three forms of phosphorus, including phosphite (PO3), with three forms of potassium, plus nitrogen in ammonium form to help facilitate phosphorus uptake. That multi-form approach is meant to keep phosphorus and potassium available across a range of bloom-stage conditions.

Can Fire be used with my existing nutrient program?

Yes, Fire is formulated to be incorporated into an existing base nutrient program rather than run on its own. It layers onto HEAVY 16's Bud A/B pair, or onto another base feed, during the bloom-stage ramp.

What is the kelp blend in Fire for?

Fire includes a kelp blend of Ascophyllum nodosum and Laminaria japonica to support the natural blooming process alongside its phosphorus and potassium content. The two kelp species contribute additional trace compounds beyond the core P-K nutrition.

How does Fire's ramp-up schedule work through bloom?

Concentration is increased gradually from the initial late-vegetative introduction through the middle and late stages of bloom, rather than applied at a flat rate throughout. Following the HEAVY 16 feeding chart's ramp keeps phosphorus and potassium delivery matched to the plant's increasing bloom-stage demand.