A: You are doing nothing wrong it just butterfly bush (Buddleia spp) prefers a more inland climate, especially in our sandy soil. They do not like high humidity and watering them twice weekly should be avoided. They can develop mildew problems on their leaves if they are not getting good air circulation. Well-drained organic soil is the best. Of course, we do not want you to use any type of pesticides around the shrub as it can kill the butterfly population which should be one of the reasons for growing the butterfly bush. We planted Buddleia Lo and Behold ‘Blue Chip’, which is a trade-marked plant. We have had incredible success with it. This butterfly bush dies back in the winter but returns each year. It is a dwarf variety and so pretty.