In the week to June 3, sales of Waitrose's gardening range grew by 17%.
Total sales were 1.2% higher than the same week last year "as the sunshine over the bank holiday and the early part of the week influenced what customers bought across our shops", said retail director Ben Stimson.
At John Lewis, although home sales were down 1.8%, the outdoor living area was up 16.0%, with outdoor furniture up 10.4% and BBQs up 43.0%.
John Lewis sales were up 2% at £83.8m said merchandising operations director Jon Williams. in the week to 24 June, outdoor living continued it's strong performance with sales for the week up by 39% as customers made the most of the hot weather to spend time outside.