Buddleja/Buddleia although very invasive can easily be controlled via herbicide treatment or physically removed.
Buddleja/Buddleia often just requires one application of chemical in the mid summer period to eradicate it. However, a following monitoring visit should be made in the following year to eradicate any small remaining plants or any new seed growth that occurs.
If Buddleja/Buddleia needs to be removed immediately it can be excavated with the surrounding soils fully removing all seeds and plant material. This infested soil is then sent away to a licensed landfill allowing the area from which it was removed to immediately be developed.