Hydrangea enthusiasts are all over the web, seeking tips on how to deadhead their plants and tweak the colour of their blooms as they evolve.

The internet is abuzz with gardeners eager to learn the secrets of altering hydrangea hues, with many sites suggesting that blueing agents like aluminium sulfate can achieve a purplish tint, though the cost might put some off.

Thankfully, for those looking to adjust soil pH levels without breaking the bank, everyday kitchen items could be the answer.

To coax out a purple flourish in hydrangea flowers, the soil's pH needs a nudge into a mildly acidic range of 5.0 to 6.0.

In certain UK regions where soil pH can dip to 4.0, tossing in some eggshells could be just the trick for achieving that coveted purple bloom.

The green-thumbed gurus at Brilliant Gardener highlight that egg shells can only work their magic on acidic soil, so checking pH levels beforehand is essential.

The gardening pros also claimed that eggshells in powder form give “the best results” compared to any other food scraps.

This advice comes from the fact that powdered eggshells break down more swiftly in acidic soil, enhancing their effectiveness.

Gardening pros from This Is My Garden blog, claim that eggshells are an “incredible” way to change the colour of how your hydrangeas bloom. 

They said: “Not only is the process simple, it can change the look of your landscape without any need for replanting.”

The experts agreed that “with eggshells, grinding them into a fine powder will help speed up the process”.

Wondering how to test your soil's pH? You can do it anytime, but bear in mind that recent additions to your soil might skew the reading.

Anyone can test their soil pH using a DIY kit, which is widely available at garden centres for a relatively affordable price.

For even more accurate results, however, gardeners can send a soil sample to a laboratory for a detailed breakdown of their soil pH composition.