The truth is that female butterflies only lay eggs on their host when they detect specific chemicals through taste organs called sensilla on their forelegs. They simply will not lay eggs on a host without verifying it to be the proper host.
Although Buddlejas are not native and may be invasive in some areas, they do not harm a butterfly's offspring because a butterfly will not lay eggs on them. I have found Buddleja to be an excellent plant for attracting butterflies in my area. In addition, there are also new cultivars of Buddleja that don't produce seeds and are not invasive at all. If they are invasive in your area, consider checking them out. Here is an article about seedless Buddlejas:
http://www.portlandnursery.com...
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