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Mammoth P

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Mammoth P Microbes, the first organically derived microbial inoculant that maximizes phosphorus and micronutrient cycling to maximize bud growth, increase yield, and enhance plant health. Add it alongside any nutrient regime with confidence.

Mammoth microbes in Melbourne! This product will absolutely give you A-Grade Results!

University Developed
Developed by Growcentia’s founders at a leading US university using next-generation technology. Extensively tested by Colorado growers, and proven to increase growth by independent labs.
Beneficial Bacteria
Our beneficial bacteria act like micro bioreactors, continually producing enzymes that release nutrients. Reduces the need for a separate enzyme additive.
More Phosphorus
Increased levels of phosphorus keep the internodes shorter and focus energy on bud production. Safe For All Media Safe for use in soil, soilless, and hydroponic systems.
Protects Rhizosphere
Shields the plant rhizosphere by outcompeting potentially harmful pathogenic microbes.

Fully Compatible to use as a supplement alongside any fertilizer program.

What is the shelf life of Mammoth microbes?

Mammoth P is a stable and organically-derived natural product. Unopened, mammoth microbes will remain effective for two years after the manufacture date. Once opened, we recommend using your mammoth microbes within 18 months for best results. The manufacture date can be found in the bottom right-hand corner of the backside of the bottle. From left to right the numbers indicate the day, month, and year in which the bottle was manufactured, followed by the lot number of the bottle.

Why are some bottles of MAMMOTH P darker in colour?

Mammoth microbes may darken over time, and different colorization is completely normal. This is due to naturally-occurring redox reactions in the alfalfa extract that we use in our formula. Redox reactions are completely natural occurrences in all living materials. In general, redox reactions occur when oxygen mixes in with the formula, which causes a darker colour. We have rigorously tested colour variation and effectiveness of the microbes in mammoth microbes and we’ve found that the product is equally as effective, no matter what the colour.

Why are there chunks floating in my bottle of MAMMOTH P?

It is completely normal to see sediment floating in your bottle of mammoth microbes, being that it is an active microbial product. The sediment does not influence the effectiveness of the product and will not cause harm to your plants in any way. We simply recommend shaking your bottle of mammoth microbes well before use.


*All orders are dispatched in unmarked boxes to maintain your privacy.*


Orders are shipped via Australia Post or Big Post. Orders are generally dispatched on Tuesday, Wednesday and Friday. Please allow for additional delivery time for remote areas. If you require express delivery, please contact our sales representatives at 03 9555 6667 or email to obtain a quote. 

Couriers will attempt delivery to the specified address. If no one is home to receive the delivery, the couriers will leave your parcel somewhere safe. If there is no safe place, re-delivery or collection will be organised.

We reserve the right to charge for any redeliveries if they occur. You are welcome to call us if special arrangements need to be made.  

Due to the increasing frequency of online fraud and theft, we are unable to ship to P.O. Boxes and Parcel Lockers.


All freight charges are calculated on weight, dimensions and location. We are committed to keeping shipping charges at a minimum and do not charge handling fees.

Please note: Freight costs are subject to change. Regional areas, large and bulky orders, and tail-lift delivery occasionally incur an additional levy. Should these costs need to be amended it will be to reflect the actual charges, and not incur additional ‘shipping and handling’ fees.

We will notify you if this rare situation occurs.



All payments must be cleared before dispatch. Payments can be made online via PayPal, AfterPay or Electronic Funds Transfer. Payments can also be accepted via credit card by phoning 03 9555 6667.

Please allow at least 24 hours for payments to clear.


You will be notified immediately if an item is permanently unavailable, with options for a replacement item at equal or higher value, refund or store credit.

All refunds will clear within 3-5 business days. Store Credits will be issued as an electronic Gift Card to be used online or in-store.


We comply with all necessary restrictions and guidelines when shipping any products classified under the Dangerous & Prohibited Goods & Packaging Post Guide.

If, for any reason in compliance with these guidelines, we are unable to fulfil an order a refund will be issued immediately.