What flowering bush blooms the longest?
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.