Answer: Buddleia davidii is probably the best choice of butterfly bush for your gardening region. These plants provide fast, rank growth each summer (from 3-10 feet, depending upon moisture supplied and soil type). If you get freezing weather, the soft wood will freeze down to the ground, but the hardy roots will send out new stems in the spring. Older wood will remain if you don't get a freeze, and will send out side-shoots, which will produce flowers in the summer time. To keep plants under control, prune out some of the older wood each year after blooming has stopped.
Buddleia is a vigorously growing plant and you can save money by purchasing plants in one-gallon containers. They will fill in the alloted spaces in one or two growing seasons.
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