1. Mammoth P Active Microbials
2. Mammoth Control

After a year-long hiatus, Mammoth P is back—and at a lower price than before. This microbial inoculant has long been trusted by both commercial growers and hobbyists to unlock more yield, better terpene profiles, and healthier root systems. Backed by peer-reviewed studies, Mammoth P makes phosphorus—the backbone nutrient for plant energy and flowering—more available than ever.

If you’re wondering whether Mammoth P is right for your grow, this guide answers the top questions we get from customers at GrowersHouse and breaks down why this product continues to stand out.

[Short on time? Here’s a TLDR summary - Mammoth P is back—now at a lower price—bringing growers one of the most effective phosphorus-mobilizing microbial products on the market. Backed by university studies, Mammoth P uses a consortium of beneficial bacteria (including Enterobacter cloacae) to unlock bound phosphorus and micronutrients in your soil, improving nutrient uptake, plant health, and yields. Whether you’re running soil, coco, or hydro, Mammoth P makes phosphorus more available exactly when your plants need it most, especially during flowering. The result? Bigger buds, better flavors, and higher returns—all with less wasted fertilizer.]

Absolutely—because it enables you to maximize the phosphorus you’re already investing in.

Phosphorus fertilizers can be inefficient, with a large portion of the P becoming locked in soil or media.

The microbes in Mammoth P function as biological unlockers, solubilizing bound phosphorus so your plants can utilize it instead of letting it go to waste. 

A study across various crop types demonstrated consistent growth promotion, increased biomass, and enhanced nutrient use efficiency when Mammoth P was applied (Read here— Phosphorus_mobilizing_consorti)

The return on investment stems from both improved yields and decreased fertilizer waste.

Mammoth P contains a proprietary microbial consortium chosen its for ability to mobilize phosphorus.

Key organisms include: 

• ●Enterobacter cloacae 
• ●Citrobacter freundii
• ●Comamonas testosteroni 
• ●Pseudomonas putida 

These microbes produce enzymes that unlock bound phosphorus and micronutrients. Think of them as “beneficial bacteria teammates” collaborating with your root zone to ensure nutrients keep flowing.

The “P” in N-P-K fertilizer labels stands for phosphorus (P₂O₅ equivalent).

Phosphorus plays a crucial role in: 

• ●Energy transfer (ATP) 
• ●Root growth and development 
• ●Flower initiation and seed formation 
• ●Without sufficient phosphorus, plants can struggle—yield and quality both decline.

Mammoth P is a living product, so proper storage is important. Unopened containers kept in a cool, dry environment remain viable for well over a year.

Once opened, keep sealed and avoid extreme temperatures. The microbes are robust and shelf-stable under standard grower conditions, but always verify expiration guidance on the label.

A 2017 peer-reviewed study tested Mammoth P on C*nn*bis sativa grown in coco/perlite under typical indoor cultivation conditions. The researchers compared plants treated with Mammoth P to a control group that received the same nutrients but without Mammoth P.

Key Findings:

• ●Yield Boost: Plants treated with Mammoth P produced 16.5% more bud yield than untreated plants (295.7 g vs 253.9 g per light on average) Effects_of_a_Microbial_Biostimu…
  
• ●Stronger Plants: Treated plants were taller (+4.1 cm) and had thicker stems (+13.5% basal diameter)
• ●Integration: Mammoth P worked seamlessly with existing hydro/soil-less nutrient regimens—no need to change standard practices.

• Why It Matters:
  For indoor growers, where every gram of bud counts against high operating costs, a 16.5% increase in yield can significantly boost net income while reducing risk. Mammoth P helps plants grow stronger and more productive without requiring a change in your grow system.

  Read the full study here