Nicholas Marshall, chief executive of The Garden Centre Group, said: "We are delighted that David opened the Rose Centre at Syon Park Garden Centre for us.
"It has one of the largest collections of English roses supplied by David Austin Roses in the country.
"Syon Park Garden Centre was opened in 1968 by Her Majesty Queen Elizabeth II and was a pioneer in the garden centre world. It was the first garden centre of its kind and paved the way for a thriving industry. The Rose Centre is a perfect addition."
The new centre stocks shrubs, climbers, rambling and old varieties of David Austin Roses.
Tim Clapp, head of horticulture for The Garden Centre Group, said: "It is aimed at rose enthusiasts and has more than 200 varieties of roses on offer. These include up and coming rare and unusual specimens of English roses, which only have limited availability and are always in high demand.
"The centre also stocks a wide range of popular roses that you will find in all of our garden centres nationwide. The new Rose Centre at Syon Park therefore offers an exceptionally diverse selection of roses."