The plant, bred over 10 years of trials by Tim Kerley, was entered for Chelsea plant of the year. He said the plant was robust and had been described as "bombproof" by Alton Garden Centre director Andy Bunker.
PowerDaisy is hardy to -10C, drought tolerant and designed for early and late season sales. Channel Island Plants and Kientzler are among growers and Thompson & Morgan is listing PowerDaisy among retail mail order sellers.
The plant is long-listed among 40 new varieties for Chelsea's plant of the year, to be judged on 23 May.
Peter Seabrook will also include PowerDaisy in his 40 new plants featured in an industry-backed Sun Flower Square Chelsea exhibit.
The Kerleys said the RHS could consider splitting the plant of the year awards into trees, shrubs and bedding to make plants easier to judge.
Petunia Tumbelina 'Anna', a pink double with rose rim, will be available from Ball Colegrave in 2016 and will also be introduced at Chelsea this year on the Peter Seabrook/HTA exhibit.
The RHS awarded Petunia 'Priscilla' an Award of Garden Merit this year.
See more in HW 27 May issue.