About this product

Vitax Hydrangea Colourant 250g

Confirmed format: Specialist hydrangea colourant • 250g pack • for pink-to-blue colour development • suitable for pots and outdoor hydrangeas • product code 5HC250

Product Highlights: Helps turn pink hydrangeas blue • Pale pink varieties give the best blue results • Darker pink varieties may develop mauve-blue flowers • Suitable for pots, containers, beds and borders • Works best in acidic soil • Can be mixed into soil at planting or dissolved for weekly watering during growth • Contains iron and aluminium salts associated with blue hydrangea colour development

Overview

Vitax Hydrangea Colourant 250g is a specialist treatment for gardeners who want to encourage blue flowers on suitable pink hydrangeas. Hydrangea flower colour is influenced by growing conditions and the availability of iron and aluminium salts in the soil, and this colourant provides the conditions needed to encourage blue development.

Naturally pale pink hydrangea varieties tend to turn blue most successfully, while darker pink varieties may develop attractive mauve-to-blue shades. Results also depend on the variety: some hydrangeas are bred to remain pink and will not change colour.

Suitable for both pot-grown and outdoor hydrangeas, Vitax Hydrangea Colourant can be incorporated into the soil around the developing root system or dissolved and applied with water during active growth.

Why We Love It

• Specialist hydrangea treatment – formulated specifically to encourage blue flower colour.

• Works in pots or borders – suitable for container-grown and outdoor hydrangeas.

• Two application methods – mix into soil or apply dissolved in water.

• Best for pale pink varieties – these generally give the strongest blue response.

• Useful for established plants – can be watered on weekly during active growth.

• Compact 250g pack – convenient for home gardeners with a small number of hydrangeas.

Product Details

How to Use

When Potting or Planting

Mix 1 part Vitax Hydrangea Colourant with 30 parts soil in the area where the hydrangea's root system will develop.

For the 250g pack, this corresponds to approximately 250g colourant per 7.5 litres of soil.

Mix thoroughly rather than concentrating the product immediately against the roots.

Established Hydrangeas

During active growth, apply 30g of Hydrangea Colourant per 5 litres of water once a week.

The colourant dissolves readily when first mixed with a little hot water. Dilute to the required final volume before applying around the plant.

Alkaline Soil

Vitax advises that best results are obtained in acidic soil. Where soil is alkaline, the recommended proportions should be doubled.

For hydrangeas being grown where naturally alkaline conditions are unsuitable, using an appropriate ericaceous growing medium may provide a more suitable root environment.

Application Guide

Understanding Hydrangea Colour

Hydrangea flower colour is strongly influenced by both plant variety and soil conditions.

Hydrangeas growing where suitable iron or aluminium salts are available tend to develop bluer flowers. Pale pink varieties generally respond most strongly, while darker pink hydrangeas are more likely to become mauve or blue-mauve.

The colour change is not guaranteed for every hydrangea. Some varieties are genetically selected to remain pink regardless of soil conditions, so check the plant label where possible before treatment.

Perfect For

• Pink hydrangeas suitable for colour change

• Encouraging blue hydrangea flowers

• Maintaining favourable conditions for blue-flowering varieties

• Pot-grown hydrangeas

• Patio containers and tubs

• Hydrangeas planted in beds and borders

• Acidic growing conditions

Good to Know

Vitax Hydrangea Colourant is a specialist colour-changing treatment rather than a general-purpose plant food.

Results depend on the hydrangea variety and growing conditions, so the final flower colour may range from blue to mauve-blue rather than an identical shade on every plant.

For the strongest results, maintain the growing conditions preferred by acid-loving hydrangeas and follow the application directions consistently during active growth.

Safety & Storage

Wear protective gloves when handling the product and eye protection where possible.

Wash hands and any exposed skin thoroughly after use.

Keep the product out of reach of children and store securely in its original container.

Do not exceed the recommended application rates. Always follow the directions and safety information printed on the current product packaging.

Product Information