Tim Clapp, who was appointed from Wyevale Garden Centres earlier this year as B&Q horticulture and garden care lead buyer, said sales have been strong this season.
"For Christmas 2015 we are planning to sell 300,000 Christmas trees, with our Nordman trees all sourced from Scotland," he added. "We have also moved our entire poinsettia production from Holland to UK growers.
"Our year-on-year sales are up significantly, with both bedding plants and hardy plants performing strongly. A strong press and TV campaign has helped to deliver some impressive numbers - 80,000 lavenders sold in one week, 1.1 million packs of bedding over seven days and 800,000 bags of compost in one week.
"Year-to-date sales of lavender, hydrangea and acers are all up more than 30 per cent and pot bedding sales up 20 per cent. We have also significantly reduced plant wastage by more than 50 per cent through careful stock management and working closely with our growers."
Meanwhile, at its Christmas launch last week Dobbies said its Christmas trees will come from Scotland. Waitrose said its trees are all British. Wyevale Garden Centres also launched its Christmas range at a London showcase earlier this week.