What is the longest lasting flowering shrub?
Butterfly bush have one of the longest bloom times of all garden plants: they seem to never be without flowers from early summer through autumn. This makes them perhaps better called “continuous bloomers” over rebloomers, since they don’t really take a break like other plants on this list do. While many perennial flowers have long bloom times, the threadleaf coreopsis Moonbeam variety (Coreopsis verticillata ‘Moonbeam’) is a perennial with the longest bloom time. Moonbeam blooms early in the summer and will continue to do so until the end of the fall.Perennials are like a gift that keeps on giving. While annuals live for just one growing season, then die off, perennials can live for several years. flowering perennials usually bloom for only one season each year (either spring, summer, or fall), when conditions are more favorable.