The judges said Summerhill, based in Billericay, Essex, had "used height for an unusual, eye-catching and effective display".
Summerhill planteria manager Karl Rohrbach said the display made the roses one of his top sellers last autumn. "It has helped sales. Looking at what has gone through the tills, the roses have held their heads above everything else. The display and new packaging make it a strong-selling product."
Rohrbach said the strongest sellers were commemorative roses, but they had sold well across the board. He will build a new display for the spring. Chessum has been a Summerhill rose supplier for almost 30 years.
Meanwhile, Chessum is celebrating 50 years of growing. Paul Chessum began producing roses in Bedfordshire in 1964 - initially growing roses in his parents' back garden before expanding into his own nursery, which now has two million roses in production. He remains head of production and Dave Andrews is now business development manager.