Sheridragonfly said:You know I have never had a butterfly bush spread or be invasive in my entire life of growing flowers.
Sheri
The term invasive has nothing to do with how they behave in your garden, but the effect on the environment. When plants escape cultivation the can have a negative impact on the native ecosystem. Butterfly Bush is considered one of those that has escaped and had a negative impact. But unless it is strictly prohibited in your state I would say, to each his own and let your conscious be your guide. As stone pointed out yours is probably sterile so would not be an issue with invasiveness anyway. If you do have any that do produce seed then deheading would be advisable.
