Monkton Elm planteria manager Andrew Pitman said: "The new all-weather canopy houses a large undercover sales area for our hardy outdoor plants, enabling our customers to shop in all weather conditions.
"Although undercover it is still open and airy so it’s perfect for keeping the plants looking good whatever the weather."
Hillier said: "I was thrilled to officially declare Monkton Elm Garden & Pet Centre’s new canopy area open.
"We are very proud of our relationship with the garden centre and have worked closely with it to bring its customers the very best plants to make their gardens beautiful. It’s great to see the garden centre thriving and expanding."