Cytisus spachianus is rated zones 8-10; it will not survive Maine winters (-20°F) in ground. Dig and pot in large containers; keep indoors in cool, bright location with minimal water and no fertilizer.
Alternatively, replace with a hardy broom like Cytisus scoparius (zone 5).
Reviving Knockout Roses After a Harsh Winter in Zone 4
Protecting Pygmy Sundews and Drosera Regia from Frost in Zone 9
Protecting Bog Gardens from Extreme Cold: -10°F Emergency Measures
Overwintering Persian Shield (Strobilanthes) in Zone 5
Winter Protection for Loquats, Windmill Palms, and Tropical-Look Plants in Zone 7
Overwintering Geraniums: The Pot-and-Dormancy Method
Coleus & Hibiscus in Dallas (Zone 8b): Winter Survival Guide
Overwintering Peonies and Daylilies in an Unheated Garage
Dipladenia (Mandevilla) Overwintering Indoors: Dormancy Care Protocol
Fall Cleanup: What to Do with Dead Perennials and Annuals — Leave, Cut, or Dig?
Overwintering Lilac Saplings in Toronto (Zone 5)
Overwintering Container Shrubs in Cold Climates: Blueberry and Arborvitae
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