Hydrangeas should be a spectacular addition to any garden with their large and plentiful blooms, but for those saddened by the lacklustre display or small or sparse flowers, all may not be lost. If your hydrangeas are failing to show off, you're probably missing a trick that is easy to follow.

Taking to the Hydrangeas in the UK Facebook page, gardening fan Karen Jackson was fed up with the size of her flowers and asked for advice on how to grow bigger mophead hydrangea blooms, otherwise known as hydrangea macrophylla. She wrote: “Hi, I am new to the group. I am hoping I can get some ideas on how to get bigger blooms on my mopheads. These are my hydrangeas. Thanks.” Sharing a photo of her hydrangeas in the shades of light and dark pink and white, planted beside each other in a row, the blooms appeared wilting and relatively small.

Of the three responses Karen received, they all said the same thing: make sure to water hydrangeas enough.

Shelly Bancroft wrote: “Hydrangeas need a lot of water. It’s more important than feeding them. I have three very big ones now, love them.”

Laura Perry urged: “Just water well, as the saying I’ve heard goes: ‘hydrangea by name, hydration by nature’. I spend 30 seconds to a minute deeply watering them.

“Feed them a little, but not too much (I tend to feed two to three times between March and September, so every eight weeks on average).”

It may seem obvious, but if your hydrangeas are struggling to bloom, then it is best to check to make sure they are being watered enough and that their soil is well-draining so the roots are not constantly soaking in water.

Henry Wilson replied: “Just make sure you water them enough, that’s the most important. I’ve got some blooms the size of footballs, others a lot smaller, depending on the type.

“Be careful overfeeding as hydrangeas aren’t hungry and it is recommended to feed between two and three times in a season, with the latest feed being July (depending on where you live) as you will encourage new foliage to grow which will die in winter.”

Taking to his TikTok account @garden_with_tom, Tom Strowlger claimed that water is a “must” when it comes to hydrangeas.

He said, “They love their water. We must keep the soil moist so hydrangeas stay in tip-top condition. So it’s regular watering needed.”

Remember, under-watering may cause wilting and reduced blooms, but over-watering leads to root rot.