How invasive are butterfly bushes in small areas?

I would like to plant a butterfly bush in my small enclosed patio garden but I have been reading that they are extremely invasive. Is this true and if so is there another shrub that would do as well? - Sheila

Butterfly bush is considered an invasive plant in many parts of the country but not in the Kansas City area. Rarely if ever does it reseed in our climate. I would continue to plant this great summer flowering shrub. Another thought –– many of the newer varieties on the market are now sterile which means they should not produce seeds. Dennis – Johnson County Extension

This story was originally published April 21, 2014 at 10:13 AM with the headline "How invasive are butterfly bushes in small areas? ."