How well do the Rock & Roll Alstoemeria perform in the long run? They are available at any box store around here being sold as perennials. While the colors & variegation aren't "for me," they do look great when they show up at the stores but look less than stellar within a week. I assumed that was due to the lack of care, but now I'm thinking it is the heat. --Jerry Lehmann, Olathe, KS, USA