Mango Tango Anise Hyssop Agastache hybrid

I grew several varieties of Proven Winners anise hyssop that I bought from a local nursery. I planted them in the same sunny bed that stays too dry for more water-loving plants. The Mango Tango struggled compared with the other varieties, and one eventually died. I bought another to replace it and it died as well. The Rosie Posie variety did phenomenally well, and got to an even larger size than expected. I'm not sure if there is some issue with the Mango Tango variety, or if I just had bad luck, but either way I am buying more Rosie Posie next year. They are gorgeous!