Pugster Blue® ('SMNBDBT') Butterfly Bush blooms throughout the summer and into the fall, producing large blue flowers on sturdy short stems. The growth habit of Buddleia x Pugster Blue® is very compact, making this a good candidate for containers and perennial borders. The blooms are fragrant, and attract butterflies and other pollinators all summer. The Pugster® series from Spring Meadow shows better winter cold tolerance than other dwarf Buddleias.