Butterfly Bush (Buddleia spp)
A casual observation from Virginia where we have planted several Butterfly Bushes import from Asia. We have a small butterfly garden that has several large butterfly bushes that grow each year. The white colored flowers typically tend to attract more butterflies than the purple ones do ... during one year... but then the purple plants attract more the following year. We have yellow flowered plants that seemingly are ignored no matter what the year. Just an odd observation. William