Butterfly bushes (Buddleia) are lovely decorative plants that attract scores of butterflies, plus the occasional hummingbird.  Most bloom in early to mid-July, hence the nickname "summer lilac".

With proper care your butterfly bush can be persuaded to rebloom two or three times druing the growing season.  Pruning is the key to stimulating flowering, and it's not difficult.

Once your butterfly bush has finished blooming, cut back the branches by one third.  Be sure the plant is well-mulched and water if the weather is very dry.  You should see new leaves within a few days and more flowers in about a month's time (more or less, depending on weather).  You can repeat this step after every bloom cycle.

There is only one caveat with butterfly bushes.  In some parts of the country they are considered invasive.  A quick call to your county Cooperative Extension agent will tell you whether or not the shrubs are a problem in your area.