It has tiny creamy white flowers, sometimes flushed rose and usually with some spotting on the inner part of each flower and very narrow leaves.
It is difficult to grow and displays are rare as it does not flower every year. It should be blooming for the next week and is part of a rhododendron display just off Middle Ride above the Hidden Gardens in The Savill Garden.
Harvey Stephens, head of The Savill Garden, said: "The competition was tough and we are delighted with our performance at the Show. The spring flower displays are fantastic in The Savill and Valley Gardens, and it was a great pleasure for the Garden Department to select the competition blooms.
"This show follows on from our success at the recent RHS Early Rhododendron Show at Wisley where we won many best in class prizes including the Phostrogen Cup for the best single truss which was the magnificent Himalayan species - Rhododendron hodgsonii.
"The Rhododendron displays are looking fantastic in both The Savill and Valley Gardens at the moment; and the internationally famous Punch Bowl in The Valley Garden is at its peak now and for the next week."