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FAQ Section

What stage of growth should HEAVY 16 Fire be used?

Fire can be started in the last 1–2 weeks of vegetative growth and used throughout the entire bloom cycle.

Can HEAVY 16 Fire be used with any nutrient line?

Yes, Fire is designed to integrate seamlessly into any existing nutrient program.

What makes Fire different from standard P/K boosters?

Fire is brewed and aged rather than simply blended, creating superior nutrient synergy and availability.

Does Fire improve root development?

Yes, when used in late veg, Fire supports larger, more resilient root mass.

Is HEAVY 16 Fire organic?

It provides organic matter and kelp extracts but is best described as a hybrid mineral-based supplement.

What role does phosphite play in this formula?

Phosphite (PO3) enhances phosphorus efficiency and supports bloom performance.

Is HEAVY 16 Fire suitable for soil, coco, and hydro systems?

Yes, Fire can be used across soil, coco, and hydroponic growing systems.

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Specifications $\"\"$ \n

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HEAVY 16 Fire	$\"\"$
Product Name	HEAVY 16 Fire Bloom Nutrient
SKU	H161039FR4
NPK Ratio	1 – 10 – 16
Size	16 oz, 32 oz, 1 gal, 2.5 gal, 6 gal, 15 gal, 55 gal
UPC	728028199246
Shipping Weight	11.78 lbs

What is included? $\"\"$ \n

It includes:

\n $\"\"$ HEAVY 16 Fire Bloom Booster – 1 Gallon\n
\n $\"\"$ Factory-Sealed Container\n

$\"\"$

Warranty Policy

Please check out the manufcaturers website for Warranty related issues.

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Heavy 16 Fire PK Bloom Booster

Select Size

Select Quantity

From $15.73

Original: $44.95

-65%

Heavy 16 Fire PK Bloom Booster—

$44.95

$15.73

Select Size

Select Quantity

From $15.73

Original: $44.95

-65%

Heavy 16 Fire PK Bloom Booster—

$44.95

$15.73

The Story

Heavy 16 Fire

HEAVY 16 Fire is a premium phosphorus and potassium bloom supplement engineered to enhance flowering performance and overall plant vigor. Crafted through a unique brewing and aging process, it delivers cascading phosphorus availability throughout bloom while improving nutrient uptake and root resilience. Compatible with any feeding program, Fire simplifies bloom nutrition while supporting higher yields and genetic expression.

Features & Benefits
Product Specifications
What is included?
Warranty Policy

Advanced P/K Bloom Nutrition with Cascading Delivery™

HEAVY 16 Fire combines multiple forms of phosphorus and potassium with ammonium nitrogen and cold-processed kelp to optimize nutrient assimilation, root development, and flowering intensity from late veg through harvest.

High P/K formula (1-10-16) for bloom support
Three forms of phosphorus including phosphite (PO3)
Three forms of potassium for balanced uptake
Ammonium nitrogen enhances phosphorus assimilation
Cold-processed kelp blend supports natural flowering
Compatible with any nutrient program or medium

Maximize Bloom Potential, Simplify Feeding

HEAVY 16 Fire is designed for growers seeking enhanced flower development without complex nutrient stacking. Its brewed formulation improves soil and nutrient conditions, strengthens root systems, and supports consistent phosphorus delivery, helping plants reach their full yield and quality potential.

Why HEAVY 16?

HEAVY 16 is known for hand-crafted, science-driven nutrient formulations built on strict nutritional chemistry and biological principles. Their brewed, aged products prioritize nutrient availability, system compatibility, and simplicity—allowing growers to achieve professional results with fewer bottles and greater consistency.

Why Buy From Us?

At GreenThumbDepot, you're not just another sale to a faceless corporation. You're partnering with a team genuinely invested in your success. Our legendary customer service, combined with a promise of unbeatable prices, sets us apart. We're here for you, always.

Excellent 4.8 out of 5 based on 1,247 reviews

If I could rate 6 stars I would!
If I could rate 6 stars I would! My representative Edouard B. has been shockingly responsive! Like - oh my god - an actual SERVICE oriented company. He's dug into my odd connectivity issues I've been having - and following up in an AMAZINGLY timey manner. No shit. You'll be impressed! (And the price was also unbeatable, quick shipping...it's all PERFECT). Thank you Ed!!

Customer service was outstanding great…
Customer service was outstanding great people to deal with they understand your needs and they will do their best to fulfill them there is no way I can complain about them because they are the best help out there.Thanks green thumb depot. I'll definitely order from them again

The machine is doing just what my…
The machine is doing just what my salesman told it would do (I appreciate you Ed thank you) . The machine is what we need for our new business we're starting up, soon to be llc and licensed. We are getting a lot of clients wanting our services. Ed I will be needing more of your products, thank you again.

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Great prices, fantastic customer service, and mind blowing shipping! Incredible. Will be using again and telling anyone in need.