Gold Label Ultra PK 5L – Professional PK Flowering Booster

Gold Label Ultra PK 5L is a highly concentrated phosphorus and potassium flowering booster designed to support vigorous flower and fruit development during the generative stage.

Featuring Gold Label's advanced Super FK formula, Ultra PK is designed to provide effective phosphorus and potassium uptake across a broad pH range while maintaining the availability of calcium, magnesium, and important micronutrients.

Suitable for all growing media, systems, and nutrient programs, Gold Label Ultra PK is a versatile flowering additive that can be incorporated into an existing feeding schedule or used alongside the complete Gold Label nutrient range.

Concentrated PK Flowering Booster

During flowering, plants require phosphorus and potassium to support a range of essential developmental processes.

Gold Label Ultra PK provides these important nutrients in a highly concentrated formulation designed specifically for the flowering phase.

Its concentrated formula means only a small amount is required, with a recommended dosage of just 0.25–0.5ml per liter of water.

Advanced Super FK Formula

Gold Label Ultra PK uses the brand's Super FK technology, designed to improve PK availability across a broad pH range.

A key advantage of the formulation is that the additional PK is designed not to interfere with the uptake of calcium and magnesium, helping maintain a more balanced nutrient program during flowering.

The formulation also supports the continued uptake of important micronutrients.

Designed for Flower & Fruit Development

Gold Label Ultra PK 5L is intended for use during the generative or flowering phase.

The additional phosphorus and potassium support healthy flower and fruit development while complementing the nutrients already supplied by your base feed.

Ultra PK should therefore be used as a flowering additive alongside a suitable base nutrient, rather than as a replacement for your main nutrient program.

Suitable for All Growing Media & Systems

Gold Label has designed Ultra PK for broad compatibility.

It can be used with:

• Hydroponic growing systems

• Coco substrates

• Soil and peat-based media

• Recirculating systems

• Drip irrigation systems

• Gold Label base nutrients

• Other suitable nutrient programs

The formulation is also designed to help keep drip lines clean, making it particularly useful in irrigation-based growing systems.

How to Use Gold Label Ultra PK

Shake well before use.

Add Gold Label Ultra PK to water during the flowering phase.

Recommended Dosage

0.25–0.5ml per liter of water

Never mix concentrated nutrients together in their undiluted form. Always dilute nutrients separately into water.

Because Ultra PK is highly concentrated, avoid overdosing and follow an appropriate feeding schedule for your growing system.

Gold Label Ultra PK 5L Specifications

Why Buy Gold Label Ultra PK 5L?

• Professional PK flowering booster

• Highly concentrated phosphorus and potassium formula

• Designed specifically for the flowering phase

• Advanced Super FK formulation

• Effective across a broad pH range

• Designed to maintain calcium and magnesium uptake

• Supports micronutrient availability

• Suitable for all growing media

• Suitable for hydroponics, coco and soil

• Compatible with different nutrient programs

• Helps keep irrigation and drip lines clean

• Very concentrated 0.25–0.5ml/L dosage

• Economical 5-liter size for larger growing systems

Professional PK Nutrition for Flowering

Gold Label Ultra PK 5L provides growers with a concentrated source of phosphorus and potassium specifically designed for the flowering stage.

Its Super FK formulation, broad system compatibility, and low application rate make Ultra PK an effective addition to a professional flowering nutrient program, particularly when used alongside Gold Label base nutrients and stimulators.