Hydrangeas are popular plants in the UK. They come in many colors and can flower for months. A gardener says you can make them bloom better by adding a kitchen scrap to the soil. They can also change color.

A gardener named Brittany shared a video on TikTok. She showed her hydrangeas to her 28,000 followers. Some had kitchen scraps and some did not. The results were very different.

The video said: 'This is the difference between using coffee grounds and not. The deepest blue I've seen.'

First, Brittany showed the hydrangeas without coffee grounds. They were a nice color but small and had few blooms.

Then she showed the hydrangeas with coffee grounds. They were a beautiful blue and had many blooms.

Coffee grounds make the soil more acidic.

The hydrangeas with coffee grounds were also bigger and had more blooms.

Coffee grounds help turn hydrangeas blue by making the soil more acidic.

When the soil is acidic, the flowers can absorb a metal that turns them blue. This only works for some types of hydrangeas.

Some types of hydrangeas will never turn blue.

The video got over 145,000 likes and many gardening fans were impressed.

One user asked: 'How does it work? Do you put the coffee grounds on the soil or mix it in?'

Another user said: 'You can sprinkle the grounds on the soil and water it. Or you can pour old coffee on the roots.'

The acidity changes the color and makes them bloom better.

A user said: 'It changes the soil's pH. Acidic soil makes blue blooms and alkaline soil makes pink blooms.'

The gardener's trick was a success and many people were interested in trying it.