Most butterfly bush, or Buddleia, species are fully hardy down to zone 5, so you don't need to worry about winterizing in most US states. Deep watering is recommended after planting.

Butterfly bushes (Buddleja davidii) are a garden staple for a reason: Not only are they ginormous -- getting up to 12 feet high -- and gorgeous, but they're magnets for pollinators and are easy to ...

Butterfly bushes grow best in USDA hardiness zones five to nine. They appreciate full sun and well-draining soil and need regular pruning to promote the longest bloom period.