House & Garden Roots Excelurator, (silver bottle), 1 L

Root-Development Additive for Hydroponic and Recirculating Systems, 1 L

Root mass built early in a grow cycle sets the ceiling for how much a plant can take up later, but not every root additive is labeled for use in an active, recirculating reservoir. House & Garden Roots Excelurator, silver bottle, is the original formula in the Roots Excelurator line, built to support root development and rated compatible with hydroponic and recirculating systems.

This 1-liter bottle is sized for a regular indoor grower dosing Roots Excelurator through a standard-length vegetative period.

Key Features & Benefits

• Classic formula — the original Roots Excelurator formulation, distinct from the gold-bottle version.
• Hydroponic and recirculating compatible — rated for use in active reservoir systems, not just soil or soilless media.
• Supports root development — designed to encourage root growth during the vegetative stage.
• Multiple sizes — available from 500 milliliters up to 20 liters.

Who Should Use This Root Additive

Growers running hydroponic or recirculating systems who want a root-development additive rated for use in an active reservoir rather than only soil or soilless media.

About House & Garden

William Van De Zwaan built House & Garden's original product formulas after moving from commercial rose growing into nutrient development, and the company's manufacturing has run out of Humboldt County, California, since 2015 following 25 years of operating in the Netherlands.

Frequently Asked Questions

Does this work in hydroponic systems?

Yes, this formula is rated compatible with hydroponic and recirculating systems, not just soil or soilless media. That distinction matters because not every root additive is labeled safe for an active, recirculating reservoir.

What is this product designed to do?

It's designed to support root development, primarily during the vegetative stage before a plant shifts into flowering. Stronger early root mass generally supports better nutrient and water uptake later in the cycle.

What size should I buy?

That depends on your garden's scale: the 500-milliliter and 1-liter bottles suit smaller or single-reservoir setups, while the 5-liter and 20-liter sizes fit regular indoor or small commercial operations dosing multiple reservoirs. Check your typical reservoir volume and dosing rate to estimate how long each size will last.

Is this the same as the gold-bottle version?

No, this is the silver bottle, which is the original, classic Roots Excelurator formula. House & Garden also sells a gold-bottle version as a separate product in the line.

How do I add this to my reservoir?

Add it alongside your base nutrients, following the dosage listed on the House & Garden feed chart for recirculating or hydroponic systems. Dosing above the chart's recommendation isn't necessary and doesn't improve on the formula's designed rate.