If you’re keen to add a burst of colour to your garden then hydrangeas are a great option to choose as they're both eye-catching and come in a variety of shades. The flowers typically bloom in mid to late summer, with blues, pinks, purples and whites being the most common colours, but the colour can actually be dependent on the type of hydrangea you choose and the type of soil you plant it in. Hydrangeas are unique not only for their striking cone and ball-shaped flowerheads but also because certain varieties can change colour .
Bigleaf hydrangeas (Hydrangea macrophylla) and mountain hydrangeas (Hydrangea serrata) have the ability to change their flower colour depending on the pH level of the soil. This is great news for gardeners who want to add a pop of blue into their garden as this colour flower is considered pretty hard to come by. True blue flowers are rare in nature with fewer than 10% of flowering plants having this colour, making hydrangeas that extra bit special.
Hydrangeas can change the colour of their flowers due to the pH levels of the soil, with acidic soil producing blue and purple flowers and alkaline soil resulting in pink or red blooms. White hydrangea varieties generally stay white regardless of the soil pH levels. So if you're eager to get striking blue blooms in your garden throughout the summer, you can alter the pH of your soil to make it more acidic to produce this colour.
According to gardening experts, sprinkiling coffee grounds in your soil is on.
