A chaotic season of extreme weather is rewriting the horticultural calendar across the UK, with ripple effects felt from France to Pennsylvania.
For Britain’s gardeners, 2026 has delivered a particular kind of heartbreak. Not from an errant late frost or a marauding slug, but from something quieter and more unsettling: borders that never fully filled in, fields sown with hope that remained barren, and garden centres with fewer customers than shade sails available.
The year’s growing season has been defined less by any single extreme event than by brutal whiplash. A cold, waterlogged start to the year gave way—with almost no transitional spring—to a blistering run of heatwaves that arrived earlier and hit harder than anything in living memory. The result is a landscape of unusually threadbare gardens, and a horticultural industry warning that this may well be the shape of summers to come.
A Spring That Never Arrived
The year began wet and bitterly cold. Parts of the UK recorded one of the wettest starts in more than a century, leaving beds waterlogged, grass growth stunted, and lambing seasons disrupted by mud rather than frost. Then, almost without a gentle warm-up, May delivered an extraordinary early heatwave: Kew Gardens recorded 35.1°C on May 26, shattering the UK’s previous May temperature record by more than two degrees. June became England’s warmest on record, and by late June a red extreme-heat warning—only previously issued once, in 2021—stayed in force for three consecutive days as temperatures threatened 40°C.
For plants, that sequence is nearly the worst possible scenario. Seeds and seedlings that struggled to establish in cold, sodden soil were then forced, within weeks, to cope with drought stress and scorching heat before they had developed the root systems to survive. Horticulturists describe the effect as plants “skipping” entire growth stages—rushing to flower and set seed prematurely, or simply giving up before blooming at all.
Sandringham, Sunflowers, and Shows Under Strain
The Royal Horticultural Society, which manages five major public gardens across England, has been explicit that this is no anomaly. Citing last year’s severe droughts, the RHS has committed to a series of emergency water-management projects spanning 2026: rainwater storage tanks, “ebb and flow” irrigation benches at its retail centres, rain gardens, and a push for home gardeners to adopt similar measures. The move represents a striking admission from an institution built on the idea of the reliably beautiful English garden—it is now planning for water scarcity as a permanent condition, not an occasional crisis.
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 simply too large to irrigate, and weeks of hoping for rain yielded nothing. “We are absolutely gutted,” the organisers said, “but we are hopeful for 2027.” Suffolk was then under a hosepipe ban after three successive heatwaves left the ground too dry to sustain the crop. Smaller sunflower patches elsewhere reported similar failures—seeds that never germinated due to 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. Water companies including Affinity Water, Anglian Water, Cambridge Water, South East Water and Southern Water all imposed 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 lock in whatever moisture the soil retains.
Empty Aisles, Not Empty Tills
Garden centres have discovered that extreme heat does not necessarily boost business—even for a sector selling shade sails and watering cans. Trade body figures showed garden centre visits declined roughly 2% in June compared with the same month last year, with gardening sales falling as much as 13% against 2024’s benchmark. The pattern echoed 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 drop at 6.2%, as record heat and red weather warnings kept shoppers indoors or pushed them online.
Industry analysts point to a deeper structural problem: wet springs delay planting and depress early-season sales, then sudden heat spikes create a rush for irrigation equipment and shade plants that arrives too late for garden centres to restock in time.
A Crisis Without Borders
The disruption is not confined to the UK. Across Western and Eastern Europe, a sequence of three successive heatwaves has deepened one of the most severe droughts on record, drying 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 alone, while 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 estimates placing the human cost at thousands of heat-related deaths across the continent, alongside 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 the majority of the lower 48 states. Gardening advice columns are steering growers toward heat-tolerant flowers—zinnias, cosmos, coneflowers, lantana—over thirstier traditional bedding plants. In Pennsylvania, one long-running sunflower festival was scrapped entirely this summer after drought combined with deer damage wiped out the crop before it could bloom, echoing the same disappointment felt in Suffolk. Japan, too, is forecast to see another summer of above-normal temperatures nationwide, with the country’s meteorological agency flagging knock-on effects for crop growth alongside the now-familiar heatstroke warnings.
A New Kind of Gardening
What emerges from this turbulent season is less a single freak year 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—leaning into 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 in Pennsylvania alike—it has meant a summer of empty fields where the flowers were supposed to be.