FoxFarm Grow Big Fertilizer 6-4-4 | 2.5gal - Concentrate - (Case of 2)

Low-pH Liquid Vegetative Fertilizer for Soil Growers, 2.5gal

Vegetative growth in soil calls for a fertilizer that holds up in storage and keeps its micronutrients from dropping out of solution, which is where FoxFarm Grow Big's low-pH formulation comes in. The 6-4-4 NPK ratio leans on nitrogen to build plant size and branching structure ahead of the transition into bloom.

The case of 2 2.5gal jugs fits operations that go through vegetative fertilizer steadily.

Key Features & Benefits

• 6-4-4 NPK ratio — nitrogen-forward to drive vegetative size and branching.
• Low-pH liquid formula — keeps micronutrients in solution and adds shelf stability.
• Built for soil growing — formulated specifically for soil use rather than hydroponic systems.
• First leg of the soil feeding trio — hands off to Tiger Bloom at the first sign of flowering.

Who Should Use Grow Big

Soil growers in the vegetative stage who want a nitrogen-forward liquid concentrate, particularly those already running Big Bloom and planning to add Tiger Bloom once flowering starts, are the fit for Grow Big.

About Fox Farms

Grow Big anchors the vegetative stage of the soil liquid feeding program FoxFarm has run since 1984, handing off to Tiger Bloom once a crop moves into flower.

Frequently Asked Questions

What does the 6-4-4 ratio in Grow Big support?

The nitrogen-forward 6-4-4 ratio is built to drive vegetative size, structure, and branching ahead of the shift into flowering. It's the heaviest nitrogen load of the three-part soil trio, reflecting its vegetative-stage role.

Is Grow Big for soil only, or can it go in a hydroponic reservoir?

Grow Big is formulated for soil use specifically. FoxFarm makes a separate product, Grow Big Hydroponic 3-2-6, with a different NPK ratio built for soilless and hydroponic systems.

When do I switch from Grow Big to a bloom fertilizer?

Once a crop shows its first signs of flowering or bud set, that's the point to transition to a phosphorus-forward bloom feed such as Tiger Bloom. Running Grow Big past that point keeps pushing vegetative growth at a time when the plant's priorities have shifted.

What does the low-pH formulation actually do?

The acidity helps the liquid concentrate stay stable in storage and keeps micronutrients from dropping out of solution before they reach the plant. That stability matters more in a concentrate that sits on a shelf between feedings than it would in a diluted, ready-to-use spray.

Does Grow Big work alongside Big Bloom and Tiger Bloom?

Yes, it's designed as one leg of that three-part soil feeding program, running through the vegetative stage before Tiger Bloom takes over for bloom. Big Bloom runs underneath both of them for the full cycle as the organic-matter component.