The UK is in the grip of one of its driest, hottest growing seasons in decades, and the damage is showing up on the produce shelf: cauliflower heads turning yellow like sunburnt skin, cucumbers curling into spirals, pak choi riddled with pest holes, and potatoes growing into knobbly shapes, according to BBC Business. Repeated heatwaves after a warmer-than-usual spring have led to predictions of the worst harvest since records began, and retailers are expected to relax strict cosmetic rules to avoid empty shelves.
'Sun-tanned' cauliflower hits supermarket spec limits
Cauliflower is one of the most affected vegetables in hot weather because it needs lots of water, BBC Business reported. Its heads are normally shielded from sunlight by the leaves, but this year more light is reaching them and turning them yellow. Emilie Vanpoperingh, co-founder of Oddbox, a subscription company that sells surplus produce that supermarkets reject, called it "purely a cosmetic defect" and said the plants taste exactly the same. Oddbox acquired 6,000 cauliflower heads last week that were too dark for supermarkets to sell. Growers are reporting depleted water reserves, Vanpoperingh said, which means the cauliflower and broccoli family of brassicas will experience slower growth and shorter supplies. Retailers may soon start stocking "sun-tanned" cauliflower because "their biggest nightmare is empty shelves", she said.
"They want to make sure that they've got availability of produce all the time." — Emilie Vanpoperingh, Oddbox co-founder, as reported by BBC Business
Curly cucumbers and heat-stressed greenhouses
Growers are also reporting cucumbers that are coming out misshapen, with some bending back into a spiral, because the plants are grown in greenhouses that overheat in high outdoor temperatures, causing stress, Vanpoperingh said. "Even if they get the irrigation then it's just extreme heat, which means the plant is not able to grow anymore."
Flea beetles riddle pak choi
John Harper, a farmer in Worcestershire, grows pak choi for Sainsbury's, Aldi and Co-op, and has discarded more produce than usual this year because of tiny holes made by pests, according to BBC Business. Flea beetles thrive in hot, dry conditions, and farmers are no longer allowed to use as many pesticides as before, meaning net covers are Harper's only defence. Supermarkets' strict cosmetic rules mean "one tiny little hole can render the plant useless", he said, but some have temporarily loosened the rules. "We've been working with them through this hot period and in general they sort of get it," he added. Harper said the vast majority of affected pak choi is still edible — even if "it seems to be quite tasty" for the beetles too.
Knobbly potatoes and the wider crop picture
The heatwave has also produced potatoes that grow into separate knobbly bits, according to BBC Business. With supplies under pressure across multiple crops, retailers are expected to loosen guidelines on size, shape and colour, meaning shoppers could soon see smaller, wonkier or oddly coloured vegetables — and sellers and growers say it's still good to eat.
Crop-by-crop heatwave impact
| Vegetable | Symptom | Reported cause by BBC Business |
|---|---|---|
| Cauliflower | Yellow, "sun-tanned" heads | More sunlight reaching heads; depleted water reserves |
| Cucumbers | Curled, spiral shapes | Greenhouses overheat; plant stress |
| Pak choi | Holes from flea beetles | Hot, dry conditions boost pests; fewer pesticides allowed |
| Potatoes | Knobbly growth | Not detailed in source |
For commodity buyers and fresh-produce procurement teams, the loosening of cosmetic standards signals that supply volumes are tightening at the farm gate, and shortfalls in brassicas and other heat-sensitive crops could persist while water reserves remain depleted, according to the growers' reports carried by BBC Business.
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