Whiplash of cold, heat and drought reshapes landscapes from Suffolk to Pennsylvania
It is a quieter grief than a frost-killed dahlia or a slug-ravaged hosta. This year, gardeners across Britain are confronting something stranger: borders that never filled in, sunflower fields that never bloomed, and garden centres with aisles full of shade sails but customers staying home.
Britain’s 2026 growing season has been defined less by a single extreme event than by violent swings between them. A cold, waterlogged start to the year gave way abruptly to record-smashing heatwaves, leaving plants stranded between too much water and not enough. The result is a patchwork of threadbare gardens and a horticultural industry warning that this may be the shape of summers to come.
A Spring That Never Had a Chance
The year began with relentless rain. Parts of the UK recorded one of the wettest first quarters in more than a century, leaving soil waterlogged, grass growth stunted and lambing seasons mired in mud. Then, with almost no transitional spring, May arrived with an extraordinary early heatwave. Kew Gardens recorded 35.1°C on May 26, shattering the UK’s previous May record by more than two degrees.
June followed as England’s warmest on record, and by late June a red extreme-heat warning — only ever issued once before, in 2021 — remained in force for three consecutive days as temperatures approached 40°C.
For plants, the timing was catastrophic. Seeds and seedlings that struggled to establish in cold, sodden soil were suddenly forced to endure drought stress and scorching heat before they had developed root systems capable of survival. Horticulturists describe the effect as plants “skipping” entire developmental stages, rushing to flower and set seed prematurely, or simply failing to bloom at all.
Sandringham, Sunflowers and Shows Under Pressure
The Royal Horticultural Society, which manages five major public gardens across England, has acknowledged that these conditions are no longer unusual. Citing last year’s severe droughts, the RHS has committed to a series of emergency water-management projects through 2026, including rainwater storage tanks, “ebb and flow” irrigation benches at its retail centres, rain gardens, and a campaign urging home gardeners to adopt similar measures.
The disruption extends far beyond show gardens. In Suffolk, the organisers of Horringer Sunflower Field near Bury St Edmunds announced they would not open this year at all. The field was too large to irrigate, and weeks of hoping for rain brought nothing. “We are absolutely gutted,” the organisers said in a statement, “but we are hopeful for 2027.” Suffolk was under a hosepipe ban after three consecutive heatwaves left the ground too dry to sustain the crop. Smaller sunflower patches elsewhere reported similar failures — seeds that never germinated because of cold snaps in early May, followed by soil too parched to recover.
By mid-July, more than eight million UK households were living under hosepipe restrictions, with water companies including Affinity Water, Anglian Water, Cambridge Water, South East Water and Southern Water all imposing bans — several for the first time in decades. Gardeners have been advised to rely on water butts, greywater from baths and washing-up bowls, and mulching to retain whatever moisture the soil holds.
Empty Aisles, Not Empty Tills
Garden centres have discovered that extreme heat is not necessarily good for business, even for a sector selling shade sails and watering cans. Trade body figures show garden centre visits dropped roughly 2% in June compared with the same month last year, with gardening sales falling as much as 13% against 2024’s benchmark. The trend mirrored the broader high street: British Retail Consortium data recorded UK-wide footfall down 3.4% year-on-year in June, with high streets seeing the sharpest decline at 6.2%, as record heat and red weather warnings kept shoppers indoors or pushed them online.
Industry analysts identify a deeper structural problem: wet springs delay planting and suppress early-season sales, while sudden heat spikes create a rush for irrigation equipment and shade plants that arrives too late for garden centres to restock in time.
A Global Pattern of Disruption
The chaos is not limited to Britain. Across Western and Eastern Europe, a sequence of three successive heatwaves has deepened one of the most severe droughts on record, drying out soils, rivers and reservoirs from France to Hungary. Wildfires have forced mass evacuations in France’s Gironde region and burned well over 100,000 hectares in Spain. The Po River in northern Italy has run at historic lows. Scientific attribution studies have found that human-caused climate change made this year’s European drought dramatically more likely — tens of times more likely in some regions — with an estimated thousands of heat-related deaths across the continent and more than a billion pounds in lost working hours in the UK.
The United States is bracing for its own difficult season. Forecasters point to an emerging El Niño pattern and an expanding drought footprint covering most of the lower 48 states, prompting gardening experts to steer growers toward heat-tolerant flowers — zinnias, cosmos, coneflowers, lantana — over thirstier traditional bedding plants. In Pennsylvania, a long-running sunflower festival was cancelled entirely this summer after drought and deer damage wiped out the crop before it could bloom, echoing the disappointment felt in Suffolk.
Japan, too, is forecast to see another summer of above-normal temperatures nationwide, with the country’s meteorological agency warning of knock-on effects for crop growth alongside the now-familiar heatstroke advisories.
A New Kind of Gardening
What emerges from this year is less a single freak season than a pattern hardening into a new normal: springs too wet or too cold for plants to establish, followed by heat and drought too extreme for them to bloom on schedule. For gardeners, that means rethinking what a garden is for — embracing drought-tolerant planting, rainwater harvesting and greywater reuse not as niche eco-gardening tips but as basic survival strategy. For institutions like the RHS, it means retrofitting some of the country’s most cherished gardens for scarcity. And for anyone who simply wanted a photo among the sunflowers this July, in Suffolk or Pennsylvania alike, it has meant a summer of empty fields where the flowers were supposed to be.