Garden Centre Association chief executive Gillie Westwood, who organised the International Garden Centre Association Congress last month, said: "Delegates worldwide said grow-your-own is expanding.
"Garden centre owners from the US, Canada, South Africa and Australia say this is a global phenomenon and long may it last."
She added: "This time around, it is more to do with provenance and the environment than it was when it boomed in the 1970s."
Bents Garden Centre marketing manager Helen Bent said: "We're expecting grow-your-own to get bigger. We have done a bit of grow-your-own this year but will be doing a lot more next year. We've sold seed potatoes and potato bags but next year we want to sell ready-planted grow-your-own products.
"Some people want to propagate but many people want easier solutions. We're aiming at the marginal gardener. It is grow-your-own without getting your hands dirty."
Bent added that this month's Bents fruit festival came on the back of what she thinks is a trend for gardeners to plant edibles trees rather than ornamental trees.
YEAR-ON-YEAR SALES GROWTH
Seeds and bulbs
Furniture and barbecues
Pets and aquatics