Should Buddleia be cut back every year?
Buddleja alternifolia should be pruned as it finishes flowering in midsummer. Cut back all the stems that have flowered to healthy buds, to produce flowering wood for the following season. Buddleja globosa should be pruned just to maintain a good shape or remove dead and damaged shoots.
Is Buddleia invasive?
It has become increasingly clear that Buddleia davidii can be highly invasive.
Is Buddleja davidii an evergreen?
Buddleia is a perennial, semi-evergreen plant. Once it has flowered, it only loses its foliage for a short period of the year. The flowers of a buddleia generally appear from July to October, with some varieties flowering as early as May.