Hydrangeas will turn 'best blue colour' and bloom quickly with common ingredient

-Credit: (Image: Getty)

Catching a glimpse of hydrangeas in the garden has always been a sight to behold. Already spoiling us with their beautiful blooms and rapid growth capacity, one easy item could help give them an extra boost this summer.

According to gardening maestro John Moore of Pyracantha, coffee grounds added to the soil can keep these flowers well hydrated as they aid roots in water absorption. Being acidic, the coffee grounds also provide soil with an enhanced iron, manganese, and phosphorus content - all vital elements required for successful plant flowering.

The garden expert said: "Hydrangeas respond well to coffee grounds in the soil. Most people use coffee grounds to help change the colour of their hydrangea blooms from pink to blue as it makes the soil more acidic but it's also useful to retain moisture in the soil between watering."

READ MORE: Amazon shoppers bag 'bright' £3 solar power garden lights in time for summer

Not only do coffee-fed hydrangeas display bold hues of blue or soft purple, but they indirectly serve as organic pest control methods too as slugs detest open exposure to both the smell and texture of coffee, keeping them away from the garden.

Using coffee ground as a fertilizer
The acidic nature of the coffee grounds will help your flowers grow, while the smell will keep the slugs at bay -Credit:Getty

Here's how to utilise those clever little coffee grounds to upgrade your hydrangeas:.

For starters, just spread used coffee grounds over the topsoil and let them decompose naturally. Alternatively, you can blend the coffee grounds directly into the soil if you would rather.

You can even add them directly into your compost bins too, but be careful because not all flowers or plants are tolerant of acidic soil.

You will also need to regularly test the soil using a pH soil tester to make sure the ground is becoming more acidic, but it should only take a small amount of coffee to help hydrangeas.

John stated: "If your starting pH is neutral (7) you don't need to add a huge amount of coffee grounds."

"If you have a start point on the alkaline side of the scale, however, you need to take your soil through the neutral point (ph 7) to the acid side.

"This takes more work and more coffee grounds and is not always very effective. You're "looking for pH 6 to pH 6.5 to get the best blue flowers."

Coffee grounds act as a soil amendment to help hydrangeas retain water which will make their flowers much bigger and more abundant.

John explained: "Adding coffee grounds, which are an organic matter, to your soil adds nitrogen and in turn, this helps the stem, leaf and root development of your plants."

"The soil retains moisture, keeping the roots wetter for longer. If your soil is a bit sticky, add the coffee grounds to your compost to help the soil drain much more easily."

However, only use coffee grounds in moderation as you only need to feed each hydrangea plant one cup of coffee grounds each month to get the benefits.

The nitrogen in coffee is great for the roots which is how it helps the plant hydrate, but too much fertilisation can cause a nitrogen imbalance which will cause the leaves to turn yellow and could stunt the hydrangea's growth so make sure not to overdo it.