Liquid Alum Sulphate Hydrangea 500ml

Apply to hydrangeas to produce and deepen blue coloured flowers. Supplies aluminium, which is needed to produce intense blue-coloured hydrangea flowers. An easy to use liquid formulation, Yates Hydrangea Blueing Tonic is easy to dilute and apply with no handling of dusty powders.

Download: Safety data sheet
Features

Soil pH affects the colour of hydrangea flowers
Acidic soil (pH 4.5-5.5) will produce blue flowers
Less acidic soil (pH 5.5 to 7) will produce pale, purplish flowers
Alkaline soil (pH 7 to 8.5) will turn flowers pink

Ingredients

Aluminium (Al) as aluminium sulphate 2.5% w/v

How to Use

Application - change hydrangea flower colour to blue; maintain blue flower colour

Rate - Mix 20ml in 5L of water

Frequency - Every 3 to 4 weeks

Timing - Apply any time of the year or after winter pruning to adjust and maintain flower colour

Area - 5L / 5m2: Apply to moist soil around plant

For optimum results apply as part of a soil treatment program with Yates Soil Acidifier. This will help with reducing soil pH, while also supplying the aluminium necessary for blue flowers. Check the soil pH before and during treatment (at least every 3 months): the optimum soil pH to ensure blue flowers is 4.5-5.5. Do not reduce soil pH below this range as this could lead to plant damage. It is best to apply many smaller treatments rather than a single large treatment.