Diva

Swan Island Dahlias introduced Diva in 2010, and the name was not modest by accident; this is their working purple, built to produce. Heirloom Soul featured it in a piece on productive versus wow-factor varieties and concluded it is both, with huge heads and hyper productivity in blooms and tubers alike. It sold out at Sweet Potomac and Artemis, the kind of boutique-farm sellout that tracks rising demand a season before the big catalogs feel it. Iridescent purple photographs richer than flat purple ever will. Growers who plant one row tend to plant three the next year.

Diva is a BB formal decorative, ADS classification 3009, with 4 to 6 inch blooms per Idlewild Blooms, though some growers describe heads pushing larger with hard disbudding. Heirloom Soul puts it on their most-productive list with huge heads and hyper production in both blooms and tubers, a rare double. That tuber habit makes it a smart variety to buy once and propagate forever; clumps divide generously. Standard pinch and net culture, with afternoon shade helping the iridescent purple hold instead of bronzing in hot sun. Thomas Edison goes bigger and darker on a 1929 pedigree if you want the full dinnerplate statement, but Diva will hand you several times the stems per plant.