Fox Farm Grow Big Hydro – Liquid Hydroponic Vegetative Growth Nutrient

Grow Big Hydro by Fox Farm is a fast-acting, water-soluble liquid nutrient specifically formulated for hydroponic systems. Designed to support strong, compact vegetative development, it delivers a balanced NPK alongside earthworm castings and Norwegian kelp — providing the micronutrients and trace minerals needed for sturdy stems, healthy foliage, and robust structural growth.

NPK 6-4-4

A well-balanced vegetative formula with enough nitrogen to drive vigorous leafy growth, supported by phosphorus and potassium for strong root and stem development. Earthworm castings and Norwegian kelp add a broad spectrum of micronutrients and natural growth compounds to the feed.

Foliar Application

Grow Big Hydro can also be applied as a foliar spray — apply to both sides of leaves for direct nutrient uptake during the vegetative stage.

Breathable Lid Notice

Fox Farm uses breathable lids on all liquid products. There is no inner seal — a small hole in the bottle cap allows live microbes to breathe. This is intentional and does not affect product quality.