Transform your pink hydrangeas into vibrant blue with simple kitchen scraps

Hydrangea range in color from pink to blue , with every shade of fuchsia, plum and periwinkle in between.

The blooms can change color based on the amount of aluminium the plants absorb from the soil, which depends on the soil pH.

High levels of aluminium in the soil plus an acidic soil pH will generate the coveted bright blue to purple flowers . If there is less aluminium in the soil, it will create a variation of pink blooms.

• Hydrangeas will turn a beautiful deep pink color with a simple ingredient

• Beautiful hydrangeas will bloom in spring if gardeners follow this simple tip

Not all hydrangea species change color, however. White ones do not change, and some varieties are bred for a specific color palette.

The first thing you need to do is test the pH of your soil. Acidic soil (lower pH) will yield blue flowers and alkaline (higher pH) will give you pink flowers.

So what can you use to alter the color of your hydrangeas ?

• Hydrangea expert's tips will see 'masses of flowers' grow on the garden favorite

Taking to the Hydrangeas in the UK Facebook page, one gardener shared a photo of her "beautiful" hydrangeas bursting with vibrant blue blooms and claimed it was all down to one kitchen scrap item. Shanta Patel wrote: "This was a few years ago. Fed with coffee grounds."

She claimed that the plant was originally pink when she bought it from Ikea.

• Your hydrangeas will produce ‘no flowers at all’ if you make this common gardening mistake, warns expert

• Garden expert says wilted plants ‘will perk up for weeks’ if given sex pill

When asked about the method for using coffee grounds, Shanta advised: "Add a layer [of used coffee grounds] on top every month and water it in."

Shanta also shared her experience with changing hydrangea colors, saying she noticed a change "within the first year".

To keep soil acidity levels up, gardeners might also consider using orange peels, eggshells, or peat if available.

For those seeking quicker results, aluminum sulfate can be employed to alter the hue of pink hydrangeas to blue.