The summer lilac or butterfly bush (Buddleja) is a varietal shrub or subshrub that blooms profusely during the summer months, has an intense scent and provides valuable food for numerous insects such as butterflies, bumblebees and wild bees. However, the plant has a strong tendency to self-seed, which is why it makes sense to cut off the flowers.
Faded flowers should be cut off promptly
prevent seed formation
There are numerous Buddleja cultivars that grow to different heights and widths, and also develop different flower colors from white and cream to various shades of pink to dark purple and even violet-blue. All varieties flower very profusely - and produce seeds just as profusely, which in turn produce countless offspring. So that you don't have to constantly tear these out - which are also not varietal and mostly resemble the wild form from Asia - cut off the faded flowers during the flowering period between June / July and October (depending on the variety) whenever possible. Use sharp and clean pruning shears for this.
tips
Incidentally, you can use the stems for pure cuttings propagation, although in this case you have to separate the flower from the shoot.