Scamp won best in the floral marquee for the ninth time in the eleven year history of the show. The stand included 126 jars of daffodils arranged by owner Ron Scamp's son Adrian Scamp, and all grown at the Cornwall nursery.
Wade, 27 and based in nearby Penarth, won best in show and gold for a take on an edible plot named after and built by Alfresco, who said the garden design market is picking up locally.
It was Wade's third garden and second gold at Cardiff, which attracts about 20,000 visitors across three days at Bute Park. Her garden included an outdoor kitchen and chickens, called Nugget and Goujon.
Seven of the nine show gardens were designed by women. At Chelsea, two of the 15 show gardens will have women designers.
Three nurseries trialled more artistic displays for the first time, with Plantbase, Strete Gate Camellias and Hillview, using mentor Daryl Moore to help with displays.
Four nurseries per RHS show will present more artistic displays at other RHS shows this year, apart from Chelsea. Nurseries premiered new wood-clad Danish trolley displays and correx boards listing their achievements. They included Horticulture Week Grower of the Year winners Chrysanthemums Direct and Brookfield Plants.
Nurseries spoke of a promising start to the season, despite blooming being two-four weeks behind 2014. Decreasing oil prices and an improving economy were cited as being helpful for many of the 56 nurseries exhibiting.
The RHS promoted the Award of Garden Merit and Greening Grey Britain in show features.
Senior staff including Sue Biggs, Tim Upson, Mark Heath, Anita Foy and Dave Green - plus judges Andrew Fisher Tomlin and Lesley Watson were at the show.
Toby Buckland and Cleve West were among the speakers.
A wedding party had their photos taken at the show on the Friday, a first for the event.