What hooks me is the plant of the year designation. I have most of the Stout medal winning daylilies, the Dykes medal iris, hosta of the year, perennial of the year, AARS roses, and then I started collecting by breeder, oh my...too much! I really have to fight the compulsion to complete a series, forcing myself to try the first one and evaluate it for a year before I buy in on more. Marketers know what they are doing with series names, that's for sure.