General Hydroponics ARMOR SI 0-0-4 | 6gal

Potassium Silicate Supplement for Structural Strength and Stress Tolerance, 6gal

Heat, cold, and drought stress all show up first at the cellular level, in cell walls that are not structurally reinforced enough to hold up under pressure, well before visible wilting or damage appears. General Hydroponics ARMOR SI 0-0-4 is a potassium silicate supplement designed for use in hydroponics, coco coir, and all other growing media, strengthening plant cell walls, improving foliar development, and building resistance to heat, cold, and drought stress.

The 6gal size suits growers running ARMOR SI across a larger number of plants who want fewer reorders.

Key Features & Benefits

• 0-0-4 potassium silicate formula — supplies silicon in a form plants can take up to reinforce cell structure.
• Cell wall strengthening — builds structural resistance at the cellular level rather than after stress symptoms appear.
• Improved foliar development — supports healthier foliage alongside the structural benefits of silicon uptake.
• Any-medium compatibility — designed for use in hydroponics, coco coir, and all other growing media.

Who Should Use ARMOR SI

Growers in environments with heat, cold, or drought stress risk, or who want to build in structural resilience before stress becomes visible, are the fit for ARMOR SI. It is compatible with hydroponic, coco coir, and other growing media.

About General Hydroponics

General Hydroponics has developed hydroponic and soil nutrient formulas since Lawrence Brooke founded the company in Berkeley, California, in 1976; the brand joined the Hawthorne Gardening Company portfolio, a Scotts Miracle-Gro subsidiary, in 2015.

Frequently Asked Questions

What does ARMOR SI do?

ARMOR SI is a potassium silicate supplement that strengthens plant cell walls and improves foliar development. That added structural strength is what helps plants build resistance to heat, cold, and drought stress.

When should I start using ARMOR SI?

Silicon supplements like ARMOR SI are typically added early and used consistently through the growing cycle, since the goal is building structural resistance before stress conditions occur rather than reacting after damage appears. Follow the label's rate for your growing medium.

Which growing media is ARMOR SI compatible with?

It is designed for use in hydroponics, coco coir, and all other growing media. The medium itself does not limit whether ARMOR SI fits into a feeding program.

Do I still need my regular base nutrients?

Yes, ARMOR SI is a 0-0-4 supplement focused on silicon, not a complete feeding program, so it is meant to be layered onto an existing base nutrient schedule. Continue your regular feeding alongside it.

Is the California version of ARMOR SI a different formula?

The California-labeled version carries the same 0-0-4 potassium silicate formula as the standard product; the difference is in the product labeling itself, which is set up to meet California's state-specific requirements. Choose whichever labeled version applies to where the product will be sold or used.