Waitrose retail director Ben Stimson said: "With the warmer weather, fresh produce and lighter eating were popular. Fresh fruit and vegetables performed well, including raspberries (up 38%), prepared fruit (up 29%) and salad (up 11%).
"The spring-like feel continued with daffodil sales blooming, up 56%, as customers brightened up their homes."
At John Lewis, total sales for the week to March 11 were £76.5m, up 7.0% on last year. The company said it continued to see the influence of the different fall of Mother's Day this year compared to last year, with strong increases for key gifting categories.
Sales of outdoor living products rose by 20.6% "as a result of the increasingly spring-like weather".
Fashion sales were up 11.1% year on year and home sales were up 2.6% on last year.