Wharton's Robert Wharton said: "There are other national trials which test garden performance, but how a variety performs when grown in a pot to be sold in garden centres, is most important for Whartons.
"New varieties are sent to Whartons as budwood or finished plants by rose breeders around the world for testing. Only those that show commercial promise are held in pots for up to five years. Any varieties that do not provide good health, show no improvement on existing varieties or no other novelty reason to be held, are destroyed.
"If there are rose breeders who do not already submit their new varieties for these trials, please contact Whartons to enter their creations in these trials, which are at no cost."