The food system “remains resilient” the environment secretary has said, as she conceded fruit and vegetable shortages will likely continue for another two to four weeks.

Responding to an urgent question in the Commons as the crisis leaves supermarket shelves bare, Therese Coffey said: “I am led to believe by my officials after discussion with industry and retailers, we anticipate the situation will last about another two to four weeks.”

Fellow Tory MP Selaine Saxby asked if consumers would be better off eating seasonal produce (such as root vegetables) to help ease the shortages.

Ms Coffey replied: “A lot of people would be eating turnips right now rather than thinking necessarily about aspects of lettuce, and tomatoes and similar, but I’m conscious that consumers want a year-round choice and that is what our supermarkets, food producers and growers around the world try to satisfy.”

Four supermarkets this week imposed a limit on the number of certain fruit and vegetables each shopper could buy, shortly before the National Farmers Union had told Sky News of a risk of rationing.

Ms Coffey blamed the shortages on “very unusual weather” in places like Morocco and Spain, from where Britain sources much fresh produce during its dark winter months.

“We do recognise this particular issue right now – that’s why the department is already in discussion with retailers,” she said.

“To have snow and the amount of heat that was there and the amount of other adverse weather is pretty unusual.”

She continued: “Right now, the supermarkets have chosen a particular way, that’s why we will continue to meet them and I’m hoping that this will be a temporary issue.”

Shadow environment secretary Jim McMahon called her response “detached from the reality on the ground” and questioned “this idea that somehow it’s all external forces” of COVID, Brexit, Ukraine and energy prices behind the crisis.

“If the government don’t understand that food security is national security… frankly there is no hope for the nation,” he said.

“UK food security does remain resilient,” Ms Coffey stressed, adding “we will continue to invest in our farmers for generations to come”.

Even if the government “cannot control the weather, it is important that we try and make sure the supply continues to not be frustrated in quite the way it has been due to these unusual weather incidents,” she added.

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Earlier this week the UK’s largest tomato grower, APS Produce, which also imports tomatoes in winter to meet demand, told Sky News the shortage of British tomatoes would last until the end of April.

That’s because high energy bills deterred growers from planting tomatoes in lit, heated glasshouses in winter, delaying the usual March harvest.

Phil Pearson, group development director at APS Produce, said a “perfect storm” of energy costs hitting UK growers, bad weather in Spain and North Africa and the pandemic had impacted harvests.

“All those things combined… [means] there aren’t any tomatoes. No matter what you want to pay,” he said. “And that’s a real challenge”.

Some British farmers are also still recovering from last year’s drought, which was driven by climate change.

The British Tomato Growers Association (BTGA) said consumers expect to see “significant volumes” of British tomatoes on supermarket shelves by the end of March and early April.

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