Skip to content

Mammoth Silica




Mammoth Silica, also known as Mammoth Si, is a liquid silica supplement for plants that is specially formulated to create stronger stems and stalks in fruit and flower bearing plant varieties. It can be used in both soil and hydroponic growing and applied throughout the entire growth cycle, vegetative through blooming phases. Silica can be added to any nutrient feeding program to increase overall plant strength and vigor. Add Mammoth Si concentrated elemental-silicon additive every watering or every other watering for best results.

*08/23/21 – Product currently pending registration in all states.

Guaranteed Analysis

  • Total Nitrogen (N)………… 0.1%
    • 0.1% Nitrate Nitrogen
  • Soluble Potash (K2O)……..0.5%
  • Calcium (Ca)………………….0.1%

Also contains non-plant food ingredient

  • 0.5% Soluble Silicon (Si)

SKU: WEB-NUT-GC-MP-B Categories: , , Tag:
Your Garden's Success is our #1 Priority

HTG Supply is committed to providing you with the very best products, pricing and service in the industry. We will ship your order fast and discreetly packaged to protect your privacy. Buy with confidence knowing your HTG Supply purchase includes simple returns as well as lifetime product support. Call our team of real growing experts with your purchasing or product use questions, and we will be here to help!

See it for less somewhere else? Give us a call and we’ll beat any online competitor’s price!

Customer Service:  1-866-710-GROW (4769) | | Hours: Mon-Fri 9:00 a.m. to 5:00 p.m.


Mammoth Silica – Grow Mammoth Strong


MAMMOTH® SI was uniquely formulated to provide you a single formula and application rate to use throughout your entire growth cycle. This unique formulation allows for increased bioavailability of silicic acid to maximize plant silicon uptake.


With this unique formulation, growers can use one low use rate (0.5 mL/ GAL) from early growth all the way through bloom.


Silica helps plants improve cellular development and shows to help increase the production of cell walls. Think of silica being the mortar that holds bricks or, in this case, cells together, creating a more sturdy framework for the plant. This framework allows cell walls to work more efficiently and be more effective at their job.


Silica is known for increasing the strength of cell walls in plants. If your goal is to produce dense flowers and increased yield, you can grow the biggest flowers, but your plant stems need to support them to develop fully. If you’re an outdoor grower, heavy winds and storms can all too easily take a toll on your plants. Silica enables plants to grow thicker stems allowing the nutrients to move more easily through the plant to the areas that they are needed most.

View Product MSDS



There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.