Stewart said: "US futurologist Faith Popcorn predicts that as the world becomes a more threatening place, our gardens and homes will become more important to us.
"Safety, security and not leaving home are going to be growth areas. I'm seeing more wine chillers, fridges, fire pits and kitchens in gardens as part of my work for the Association of Professional Landscapers."
Garden Kitchens director Tony Amato has become the sole UK distributor for Luxius kitchens, made by the Netherlands-based firm Newtrend. He said: "For several years the outdoor or garden kitchen has been popular in many parts of Europe and the US."
The kitchens are made from oak and a main unit with barbecue and wine rack costs around £4,000. A full kitchen with sinks and cupboards hits the £10,000 mark.
"Previously thought of as an indulgence, the outdoor kitchen can be a great addition and may add value to a property," he said.
"The Luxius range offers a grill integrated into exclusively designed furniture with matching cupboards and a sleek overall modern design."
Luxius commissioned architectural practice De Bats to design two outdoor kitchens around the polished-metal Luxius grill with baking, cooking and stir-fry facilities.
For more retail news, see www.HorticultureWeek.co.uk.