Butterfly bush is root-hardy in your zone. Plant in ground.
Container overwintering in a garage is less reliable (roots freeze). In-ground with mulch is best.
Protecting Elevated Container CP from Deep Freezes in Portland
Winter Lighting for Highland Nepenthes in Wisconsin: Shop Lights Over SAD Lamps
Overwintering Sarracenia purpurea at High Elevation: Indoor Dormancy and Bog Garden Planning
Protecting Sarracenia During Extreme Winter Cold: A UK Grower's Guide
Waterlogged Sarracenia: Diagnosing and Recovering from Winter Rot
Protecting Pitcher Plants from Late Winter Temperature Swings in Georgia
Venus Flytrap and Sarracenia Dormancy in Southern California: Mild Winters Are Sufficient
Ornamental Cabbage and Kale Winter Survival in North Florida
DIY Front Yard Maintenance: Evergreen Care in Toronto
Protecting Container Plants from Frost in the San Francisco Bay Area
Winter Indoor Gardening: Keep Your Green Thumb Active Year-Round
Winter Gardening: Fresh Harvests and Quiet Beauty in the Cold Months
Winter Indoor Gardening: Green Thumb Therapy Year-Round
Winter Indoor Gardening: Keep Your Green Thumb Active All Year
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