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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 Liquid Aluminium Sulfate is easy to dilute and apply with no handling of dusty powders.
Soil pH affects the colour of hydrangea flowers:
Application: As a soil drench, applying to moist soil around plant
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
For optimum results apply as part of a soil treatment program with Yates Soil Acidifier Liquid Sulfur. 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.
NOT TO BE USED FOR ANY PURPOSE, OR IN ANY MANNER, CONTRARY TO THIS LABEL UNLESS AUTHORISED
Aluminium (Al) as aluminium sulphate 2.5% w/v
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