Hydrangeas are a popular choice for UK gardens, but few people know they can change colour. A gardening guru has shared the simple item you need to add to soil to make it happen.
Many gardeners proudly grow hydrangeas, yet few are aware that these stunning blooms can actually change colour. While you may already consider them a beautiful addition to your outdoor space, there is a straightforward ingredient that could inject even more character into your garden.
It transpires that introducing a key substance to the soil can cause the flowers to transform in colour, and the results are quite remarkable to see. A gardening lover has broken down everything you need to know, but has also issued a crucial warning about one particular method you should steer well clear of during the coming months.
Ish, known as Gardening with Ish on TikTok, has laid out precisely what needs to be done. There are sensible ways to tend to hydrangeas without resorting to drastic measures.
He strongly cautioned people against making one specific error in the process, however. Alongside a recent video, he wrote: "A gardening tip I hear now and [it] doesn't just seem silly, but plain dangerous. I'm talking about putting rusty nails in the soil to help boost the acidity of your plants like blue hydrangeas and rhododendron."
Today's gardening tips will show you some much more safer and effective ways compared to turning your garden beds into a nasty surprise.
In the clip, he pointed out that some gardeners believe nails will encourage hydrangea flowers to turn blue which, in theory, could eventually work. However, in his view, the risk simply isn't worth taking given the hazard of having numerous nails scattered about.
He said: "How else can you introduce iron into the soil? Well, a couple of things. You can either boost it with ericaceous compost, you can get something like this, which is just sulphate of iron, which will do just as good."
"You can water some of that straight in or you can even add pine bark chips on top. Allow that to break down and boost the acidity."
"So, you don't need to stick nails in the soil to get it going. There are much more safer ways than that."
What you might not realise is that pine bark chips can assist hydrangeas in changing colour, particularly by helping pink mophead hydrangeas (Hydrangea macrophylla) transform into blue or lavender shades. Sulphate of iron also works effectively, supporting the transition from pink to blue.
What you need to know
Particular varieties of hydrangeas can alter colour depending on soil pH levels and aluminium availability. Acidic soil (pH below 6.0) generates blue flowers, while alkaline or neutral soil (pH above 6.5) generates pink or purple flowers.
White or red varieties typically do not change colour. To shift them from blue to pink, you must add garden lime to the soil to limit aluminium uptake.
To shift them from pink to blue, apply aluminium sulphate, sulphur or acidic organic matter (such as pine needles or coffee grounds) to the soil. Transformations can take weeks to years, generally happening in spring.
You can carry out this task in May by making the modification. Just keep in mind that transformations may require time or only partially impact the current season's blooms.
Ish's advice ought to give you the results you're looking for. It really is as straightforward as incorporating a single ingredient into the soil.
