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Mammoth P

Regular price £170.96 £189.95 | Save £18.99 (9% off)
Tax included. Shipping calculated at checkout.
In Stock
SKU: 2624
Spend £50.00 more for free delivery (shipping surcharges still apply)

Mammoth P

1l - £170.96
  • 120ml
  • 250ml
  • 500ml
  • 1l - £170.96
  • 3.79l

Mammoth P


Mammoth P is a genuinely ground-breaking and unique product based on high-level biochemistry and extensive research by GrowCentia in Colorado.

This product is all about unlocking the Phosphorus already in the system and making it available to the plant, as such it has no NPK value - it is not a fertiliser.

Mammoth P is a combination of beneficial bacteria that constantly produce a diverse set of enzymes that unlock phosphorus from the bonds of other minerals in the system allowing the plant to uptake this essential element and flourish through the flowering phase.

Phosphorus is essential to many aspects of plant biology but is particularly important for vigorous root growth and prolific flowering, as such Mammoth P should be added throughout the plants cycle - this will enhance the health and development of the plant during veg but also ensure the all-important beneficial bacteria are well established for the critical aggressive flowering phase.

We suggest applying Mammoth P at a rate of 0.16ml/l throughout the life of the plant (including flushing) whatever system you are in. Initially, the labels and literature suggested increasing the dilution rate through the cycle in Soil but we have found little justification for this and considering the price tag we advise the fixed rate of 0.16ml/l throughout the cycle in all systems.

Please visit the manufacturers website for extensive test reports and much more in-depth technical information.

GrowCentia offer a 100% satisfaction guarantee so if you are not happy with the product get in touch with them at



Delivery Information

Most orders are shipped within 24 hours.

Orders are currently shipped with Parcelforce (Express 24 service for standard and heavy/bulky items) or DPD Local (Premium next-day), a signature will be required on delivery. We have been shipping orders for 15 years and our courier choices are subject to change as service levels fluctuate.

All orders are shipped on a next day courier service – you will be informed via email or SMS the evening your order leaves us so you know to expect it the next day. On the morning of delivery you will get another SMS or email informing you of the expected delivery time.

If you have any questions on delivery please get in touch.

As the website calculates some charges by weight it is possible that shipping is not calculated correctly. We reserve the right to get in touch in these circumstances we will request the additional amount or offer to refund the order.

UK Delivery

Standard delivery to the UK Mainland addresses (excluding Scottish Highlands & Islands, offshore and N.I.) is charged at a flat rate of just £5.95 per order or £7.95 (for the premium next-day service), standard delivery (with Parcelforce) is free* for orders over £50.

*Large and/or heavy items attact a surcharge from our courier - shipping surcharges are calculated per item and are applied regardless of order value.

Non-UK mainland destinations are charged by weight.

International Delivery

Coming soon…

Collect in Store (Bristol)

We now offer a 'collect in store' option, which allows you to pay for goods online and collect from our Bristol store at time that suits you (within our opening hours).

The process is simple:

  1. place your order and pay online, select 'Pick Up' at checkout;
  2. receive an email confirming that the order is ready for collection;
  3. bring/show your confirmation email and photo ID to collect your order.


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