UK Gardeners Warned Never To Do Three Jobs In A Heatwave

We’re on our third heatwave of the year, and this one’s looking extra-long. That means gardeners might be facing browning grass, drying potted plants, and wilting flowers.

Still, though your first instinct might be to spring into action when you see your plants stressed, some gardening tasks are best left ’til after the hot spell. Watering your grass, for instance, might not be necessary, even if it’s browning – and it could go against your area’s current hosepipe rules.

Here are three activities to put on pause for now:

1) Mowing

Speaking to Gardening Etc., Chris Bonnett of GardeningExpress.co.uk said that it’s important to “avoid mowing the lawn during extreme heat, as the lawn will be trying to recover from the heat or a potential drought”.

Grass that grows in very hot conditions often struggles to form healthy roots, meaning the added stress of mowing might damage it further.

Additionally, even though it might look unhealthy, even scorched grass has its protective place in your backyard.

It works as a sort of canopy for your lawn, protecting it from the extreme, drying heat of the sun.

2) Fertilising

When plants’ leaves curl and brown, you might be tempted to fertilise them, the University of California Agriculture and Natural Resources’ page reads.

But a heatwave is probably one of the worst times to do so.

“Your urge may be to whack off the dead parts and give the plant a shot of fertiliser. Hold on!” they said.

“The dead part can protect the living part from further burning. Refrain from fertilizing until temperatures drop below 90 [°F, or 32°C] during the daytime… Fertiliser pushes the plant to grow, stressing the plant even more.”

3) Aerating soil

Aerating soil every two to three years is generally a good idea – it can improve drainage and give roots access to more of those sweet, sweet nutrients.

But experts generally recommend waiting until autumn to do the job.

Luke Newnes, a gardening expert at Hillarys, told Ideal Home: “During a heatwave, your lawn is already working hard just to cope with the stress of high temperatures and dry conditions.

“Creating hundreds of small holes in the soil can increase moisture loss and make it even harder for the grass to recover when it’s already under pressure. Most lawns simply don’t have the energy reserves to bounce back properly in those conditions.”

As if you needed any more reason to hang your gardening gloves up in these punishing temps…

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Is This ‘The Coldest Summer Of The Rest Of Our Lives’?

The part of the UK I’m in is about to experience about a week’s worth of 30°C+ weather, meaning we’re in for yet another official heatwave.

This comes after March temperatures so high that they broke not one, but two records, and the hottest UK June day we’ve ever noted. Schools closed during the last heatwave; wildfires raged; trains were cancelled, and buses caught on fire.

All this is taking place while an El Niño intensifies. It’s part of a decades-long warming trend that seems to be getting worse, not better.

So is it right to say, as I’ve heard expressed in various online spaces and various publications, that this is “the coldest summer for the rest of our lives”?

The sentence rightly points to the indisputable fact that global warming is going to get more dangerous if we don’t intervene. Heatwaves have already become more likely and more extreme.

But climate is different from weather – on a summer-by-summer basis, are we going to experience conditions worse than these every year? And what does it mean if we don’t?

We asked climate experts to share their thoughts.

“This is definitely the ‘least extreme weather’ we will experience”

Speaking to HuffPost UK, Professor Lorraine Whitmarsh, MBE, the director of the Centre for Climate Change and Social Transformations (CAST) and a Professor of Environmental Psychology at the University of Bath, said 2026 will probably pale in comparison to future weather events.

“I would say this is definitely the ‘least extreme weather’ we will experience,” Prof Whitmarsh told us.

“This is how Prof Hayley Fowler puts it, who is an expert in climate impacts.”

The professor was referring to 2025′s National Emergency Briefing by Professor of Climate Change Impacts at Newcastle University, Prof Hayley Fowler.

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Still, Prof Whitmarsh added, “there’s no guarantee every year will see a hotter summer than the one before, but the general trend is certainly hotter over time”.

″‘This is the coldest year for the rest of our lives’ is very unlikely to be true”

HuffPost UK also spoke to climatologist Prof Friederike Otto, a Professor in Climate Science at the Centre for Environmental Policy at Imperial College London and the leader of World Weather Attribution (WWA).

She told us, “I think [the idea that] ‘this is the coldest year for the rest of our lives’ is very unlikely to be true, but what is certain is that unless we stop burning fossil fuels extremely rapidly and global mean temperatures are stabilised around 1.5°C, this is one of the cooler summers for the rest of our lives.”

While there may be cooler summers, and even colder overall years, ahead, in the bigger picture, 2026′s endless heatwaves might go down as a regular – even moderate – example of a “new normal”.

This is especially true if we do not urgently address climate change.

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