• PRICED TO CLEAR!
    Mammoth Silica - A-Grade Hydroponics
  • PRICED TO CLEAR!
    Mammoth Silica - A-Grade Hydroponics
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Mammoth Silica

$29.95
$59.90
$29.95
Tax included.
Size
FAQ

Q. What is MAMMOTH SILICA (SI) and what does it do?

MAMMOTH SILICA (SI) is a highly concentrated liquid silica supplement from the makers of MAMMOTH P Microbes. It delivers high-bioavailability silicic acid to strengthen plant cell walls, thicken stems, improve cellular development, and increase resilience to environmental stress — all of which support better yields in hydroponic systems.

Q. What are the active ingredients in MAMMOTH SILICA (SI)?

MAMMOTH SILICA (SI) contains 0.1% Total Nitrogen (Nitrate), 0.5% Soluble Potash (K₂O), 0.1% Calcium (Ca), and 0.5% Soluble Silicon (Si) as a non-plant food ingredient. It is derived from Calcium Nitrate, Sodium Molybdate, and Potassium Silicate.

Q. What is the correct use rate for MAMMOTH SILICA (SI)?

MAMMOTH SILICA (SI) has an ultra-low use rate of just 0.13 mL/L, making it one of the most concentrated silica supplements on the market. This keeps costs down while delivering consistent results across every watering.

Q. When should I use MAMMOTH SILICA (SI) — veg or bloom?

MAMMOTH SILICA (SI) is formulated for use throughout the entire growth cycle — from early vegetative growth all the way through the bloom phase. There is no need to switch products or change your dose between stages.

Q. Why do hydroponic plants need a silica supplement like MAMMOTH SILICA (SI)?

Soilless growing media like rockwool, coco coir, and expanded clay contain little to no plant-available silicon. Without supplementation, hydroponic plants can experience silicon deficiency, leading to weaker stems, soft cell walls, and reduced stress tolerance. MAMMOTH SILICA (SI) replenishes this essential mineral throughout your grow.

Q. How does silica strengthen plants?

Silica acts like mortar between plant cells, reinforcing cell walls and creating a sturdier structural framework. This results in thicker stems capable of supporting heavier flowers, more efficient nutrient transport through the plant, and greater resistance to pests, disease, and harsh environmental conditions.

Q. How do I add MAMMOTH SILICA (SI) to my nutrient programme?

Always add MAMMOTH SILICA (SI) first to plain water before introducing any other nutrients. This prevents silica from precipitating when it comes into contact with phosphate-containing nutrient solutions. After adding MAMMOTH SILICA (SI), wait briefly then add your remaining nutrients and adjust pH as required.

Q. Is MAMMOTH SILICA (SI) compatible with all hydroponic systems?

Yes — MAMMOTH SILICA (SI) is suitable for use in hydroponic and continuous liquid feed systems. It is compatible with standard nutrient feeding programmes and can be added to your reservoir as part of your regular watering schedule.

Q. Who makes MAMMOTH SILICA (SI)?

MAMMOTH SILICA (SI) is made by Growcentia, Inc., an agricultural biotechnology company founded by scientists from Colorado State University and the same team behind the popular MAMMOTH P Microbes product.

Q. Can I buy MAMMOTH SILICA (SI) online from A-Grade Hydroponics?

Yes! MAMMOTH SILICA (SI) is available online at A-Grade Hydroponics in 250 mL, 500 mL, and 1 L sizes. Orders are dispatched via Australia Post or Big Post and shipped in unmarked boxes for privacy. Click & Collect is also available from our Cheltenham VIC store.
How To Use
  • ⚗️ Ultra-low use rate of just 0.13 mL/L — highly concentrated and extremely cost-effective
  • ✅ Suitable for use throughout the entire growth cycle — vegetative through bloom phases
  • 🔄 One formula, one rate — no switching products between growth stages
  • For hydroponic systems: apply to reservoir as directed and adjust pH accordingly
  • Add silica first to plain water before introducing other nutrients to prevent precipitation
Pairs Well With
Mammoth Silica - A-Grade Hydroponics
Mammoth Silica - A-Grade Hydroponics

Product Details

MAMMOTH Silica (SI) – High-Bioavailability Silicic Acid Plant Supplement

From the brilliant minds behind MAMMOTH P Microbes comes MAMMOTH Silica (SI) — a revolutionary, highly concentrated plant growth formula designed to supercharge plant health, structure, and yield. Powered by high levels of silicic acid, this unique formulation is engineered to maximise silicon uptake so your plants can build stronger, more resilient structures from seedling to harvest. 🌱

🔬 What Is MAMMOTH Silica (SI)?

  • A highly concentrated liquid silica supplement designed for hydroponic & continuous liquid feed growing systems
  • Formulated by Growcentia, Inc. — the agricultural biotechnology company behind the award-winning MAMMOTH P Microbes product
  • Contains high levels of silicic acid, the plant-available form of silicon
  • Engineered for increased bioavailability of silicic acid to maximise plant silicon uptake
  • Compatible with your existing hydroponic nutrient feeding programme

💪 Key Benefits of MAMMOTH Silica (SI)

  • 🧱 Stronger cell walls — silica acts as the "mortar" between plant cells, creating a sturdier cellular framework
  • 🌿 Improved cellular development — supports more efficient and effective cellular processes throughout the plant
  • 🪨 Thicker stems & stalks — reinforces structural integrity so plants can support dense, heavy flowers
  • 🌬️ Greater environmental stress tolerance — helps plants withstand harsh conditions including heat and wind
  • 🔺 Increased yield potential — healthier plant architecture supports higher production during bloom
  • 💧 Improved nutrient transport — thicker stems allow nutrients to move more easily through the plant

📋 Guaranteed Analysis

  • Total Nitrogen (N): 0.1% (Nitrate Nitrogen)
  • Soluble Potash (K₂O): 0.5%
  • Calcium (Ca): 0.1%
  • Soluble Silicon (Si): 0.5% (non-plant food ingredient)
  • Derived from: Calcium Nitrate, Sodium Molybdate, and Potassium Silicate

💡 Application & Use Rate

  • ⚗️ Ultra-low use rate of just 0.13 mL/L — highly concentrated and extremely cost-effective
  • ✅ Suitable for use throughout the entire growth cycle — vegetative through bloom phases
  • 🔄 One formula, one rate — no switching products between growth stages
  • For hydroponic systems: apply to reservoir as directed and adjust pH accordingly
  • Add silica first to plain water before introducing other nutrients to prevent precipitation

🌱 Who Is MAMMOTH Silica (SI) For?

  • Hydroponic growers wanting stronger, more structurally sound plants
  • Growers using coco coir, rockwool, or expanded clay systems where natural silicon is absent
  • Anyone looking to boost stem strength and support heavy flowers during bloom
  • Both beginner and experienced growers seeking an easy, low-maintenance silica solution

📦 Available Sizes

  • 250 mL
  • 500 mL

MSDS Safety Data Sheet

Warranty & Returns

Please choose your products carefully, as A-Grade Hydroponics reserves the right not to accept returns based on either an incorrect choice or a change of mind.

However, we love happy customers so contact us with your query and we will do our best to accommodate you. If you have queries about a product you would like to purchase, please contact us to discuss your concerns before you buy.

A-Grade Hydroponics will honour all manufacturers warranties subject to the terms and conditions of those manufacturers. However warranty does not cover abuse, neglect, improper care, loss or damage from incorrect usage.

Warranty claims will be processed at A-Grade Hydroponics' discretion as a refund, repair or replacement. If products need to be returned to us for warranty purposes e-mail us at grow@agradehydroponics.com with the receipt/invoice number, date of purchase and a brief description of the fault (including photographs where possible). We will then issue you with a product return number.

All returns should be in original packaging and have the receipt/invoice number, date of purchase, and product return number enclosed. The product return number should also be written on the outside of the package for easy identification purposes.

A-Grade Hydroponics has a strict 'no returns' or refunds policy for liquid products, like nutrients, additives, gels, calibration fluids etc, so please choose these items carefully.

Collapsible row

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

DISPATCH AND DELIVERY

Orders are shipped via Australia Post or shipping platform 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 grow@agradehydroponics.com 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 offered by the carrier.

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

SHIPPING COSTS

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 shipping 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.

A-Grade Hydroponics reserves the right to cancel the order if shipping costs become prohibitive and customers will be issued a full refund.

PAYMENT

All payments must be cleared before dispatch. Payments can be made online via PayPal, AfterPay, PayID 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.

FULFILMENT OF ORDERS

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.

DANGEROUS AND PROHIBITED GOODS

These goods are available for in-store collection only.