Speaking earlier this week at the RHS Chelsea Flower Show, and ahead of today's launch of the industry's strategy for ornamental horticulture, Truss, said:
"Britain has long been a world-leader in gardening and horticulture, combining tradition and innovation.
"The industry is vitally important to our economy. I want to see it grow, going from strength to strength, with more people at home and abroad enjoying top-quality British plants, bulbs and flowers.
Plant and flower exports topped £65 million in 2014 and the industry contributes £10 billion a year to the UK economy, employing over 300,000 people from scientists to tree surgeons.
As part of her visit the environment secretary toured the Animal and Plant Health Agency (APHA) 'Beyond our Borders' garden.
The garden is inspired by the Defra-funded International Plant Sentinel Network (IPSN), designed to identify new and emerging plant pests and diseases and assess their impact on native UK species.