Edible flowers such as marigolds, nasturtiums and violas have risen 64 per cent at Dobbies 34 garden centres in the last year.
The 34-centre chain cites TV shows Big Allotment Challenge, Great British Bake Off and Masterchef as prompts for the trend.
Horticulture head Steve Guy said: "Every day customers ask for flowers they can grow in the garden and use in the kitchen. At first it seemed an alien concept to the mainstream cook but their popularity is really rocketing as people become more confident with how to use them."
Dobbies adds that the week beginning May 12 as its best for barbecue sales, with sales up by 86 per cent, and sales of outdoor furniture, up 58 per cent in the same week.
Sales of outdoor heaters were up 49 per cent on last year and solar lighting rose by 78 per cent.