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. 


  • 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

Related products

Project guides & articles

How to look after your bonsai

The ancient art of bonsai has been traced back to the sixth century when wealthy Japanese would decorate their homes with these miniature trees.