make Your Hydrangea Flowers Blue easy To Dissolve In Water stores Well In A Cool, Dry Place do You Want Blue Hydrangeas? Hydrangeas Are Lovely In Uk Gardens Through The Summer Months. Whether It’s A Hot & Dry Summer Or A Warm Yet Overcast One Hydrangeas Always Step Up To The Mark & Now Here’s Your Chance To Change The Colours Of Them To Your Suiting.with Big Blue Flower Heads They Are Great In Your Garden To The Eye & They Are Tactile Too. They ‘ll Bring In Beneficial Insects Too, Good News If You Are Growing Nearby Fruiting Crops Like Peas. hydrangea Colourant Is A Specially-formulated Salt Which Changes The Colour Of Pale Pink Hydrangea Varieties To Blue & Darker Pink Varieties To Blue/violet. Salts, Which Are A Combination Of Iron & Aluminium, Acidify The Soil Around The Hydrangea Roots, To Produce Big, Blue Flowers. we Recommend You Store Hydrangea Colourant In A Cool, Dry Place So That It Keeps Well & You Can Rely On It Now & In The Future. 500g Tub