The Salvia developed in Sevenoaks is a cross between Salvia Nachtvlinder (a Dutch hybrid with purple flowers that bloom for a long period) and a purple form of Salvia microphylla.
Dyson has over 250 species, cultivars and hybrids in his collection at his nursery on site at Great Comp Garden in Sevenoaks, Kent. He is an expert on New World species and has produced popular Salvias such as Dyson's Joy and Silas Dyson named after his son.
He launched the plant at his stand in the Floral Marquee (FM234) this week at Hampton Court and visitors to Great Comp Garden in Sevenoaks will also be able to view Salvia Maroon planted in the Salvia border.
The stand won a gold medal, following his silver gilt at Chelsea last month and comes after a break from the show of 10 years.
Dyson said: "I have returned to RHS Hampton Court after a 10 year break from the show and I'm absolutely delighted with the result. It's a great honour to be among the gold medal winners this year including our Kentish neighbours Hadlow College who also won best in show for their fantastic garden."
He added: "I'm really excited to be launching Salvia Maroon at RHS Hampton Court at a time of year when salvias really come into their own. I love the end of June when the Salvias have had their first flush of colour and are ready for what I call 'the Hampton hack' when we cut back the first blooms (and save them for a vase) to encourage further flowering. Bees love the drought tolerant Salvia and as you'd expect Salvia Maroon has an intense maroon colour."