Butterfly bush is a hardy shrub that pollinators love. But under certain situations it can become invasive, which has led to laws to limit the sale to sterile varieties and interspecific hybrids. But there is a question of whether the hybrids are really sterile and whether sterility impacts the benefits to bees. We get answers to these questions this week with Cara Stills, from the Ornamental Plant Breeding Program at Oregon State University.