- Butterfly bushes grow to stand between 6 and 15 feet tall, depending on the species. Flower spikes also differ in length, growing from 3 to 10 inches, depending on plant variety.
- Butterfly bushes are vigorous growers; larger varieties planted outdoors in early spring from a standard 2-3/4-inch pot may grow 3 to 4 feet in their first year and 8 to 10 feet the next. Butterfly bushes growing in year-round mild climates stay evergreen, while bushes in cooler areas are either deciduous (dying back in the winter) or herbaceous (freezing or dying back to ground level in the winter).
- Butterfly bushes' flowers are their main attraction. Species growing in year-round mild climates can bloom into late winter. However, new flower production stops when temperatures reach as high as 90 degrees Fahrenheit. In colder climates, flowers die back in the fall or winter, but the dead flowers never actually drop to the ground.
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