Jack's Classic Hydrangea Blue 7-3-3 

1.5lb $14.99

Contains micronutrients and aluminum sulfate.

Enhances blue flowers like lacecap including: blue bird, taube, fasan, mariesii, mophead varieties: nikko blue, all summer beauty, matilda gutges, and merritt's supreme.

Unique combination of high quality nutrients as well as acidifying ingredients needed to produce a lush-leafed blue flowering hydrangea.

This combined formulation of nutrients and acidic elements, along with the important addition of aluminum sulfate, will help your plants produce deep blue flowers.